CN102685510A - Image signal processing device and image signal processing method - Google Patents
Image signal processing device and image signal processing method Download PDFInfo
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- CN102685510A CN102685510A CN2011100543771A CN201110054377A CN102685510A CN 102685510 A CN102685510 A CN 102685510A CN 2011100543771 A CN2011100543771 A CN 2011100543771A CN 201110054377 A CN201110054377 A CN 201110054377A CN 102685510 A CN102685510 A CN 102685510A
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Abstract
The invention provides an image signal processing device and an image signal processing method. Image signals picked up by a pickup device are subjected to noise reduction. A first smoothing signal generation part subjects input signals of a first image processed to primary smoothing processing according to the image signals from the pickup device and generates a first smoothing signal subjected to noise reduction. A second smoothing signal generation part subjects the input signals to a secondary smoothing processing different from the first smoothing processing and accordingly generates a second smoothing signal subjected to noise reduction. A mixed processing part mixes the first smoothing signal and the second smoothing signal according to mixed rate corresponding to the value of the input signals.
Description
Technical field
The present invention relates to that the picture signal of using imaging apparatus to take is carried out noise and reduce image signal processing apparatus and the image-signal processing method of handling.
Background technology
In the past, once proposed to reduce the method for the noise that comprises in the picture signal of using imaging apparatus to take.For example, in TOHKEMY 2005-303802 communique, to carrying out modeling, produce model (reference noise model), the noisiness that comprises in the estimated image signal in advance according to its noise with the relevant noise generation of imaging apparatus that uses.Then, use estimated noisiness to carry out filtering (smoothing processing), realized the reduction of noise.
; The noisiness that comprises in the picture signal has the trend that the bright more then noisiness of this picture signal increases more; There is following problem in the noise reduction processing that therefore above-mentioned use noise produces model: though in brighter part, reduced noise; But in darker part, than bright part, noise is not lowered.
On the other hand, the smoothing of carrying out applying edge maintenance filter is sometimes handled and is reduced noise.But, in the method, owing to sometimes noise is judged to be the edge, particularly for the more picture signal of noise, the part that noise reduces effect appears in image sometimes failing to obtain.For example, under the situation of using endoscope to take in to body, owing to the illumination light quantity not sufficient, can not carry out suitable exposure and obtain darker image, thereby set higher gain.In this case, noise can increase, and therefore sometimes noise error is judged to be edge etc., noise occurs and reduces the part that effect descends.And the part that this noise reduces effect decline will cause the visual discrimination degradation, and observation is caused harmful effect.
That is, reduce noise, then as stated, in image, occur noise sometimes and reduce the relatively poor part of effect if integral image is implemented processing uniformly.
Summary of the invention
The present invention In view of the foregoing accomplishes just; Its purpose is, provides and can suppress to occur image signal processing apparatus, image-signal processing method and the image signal processing program that noise reduces the relatively poor part of effect, on integral image, obtains the effect of noise reduction preferably.
The image signal processing apparatus of a mode of the present invention carries out noise to the picture signal of being taken by imaging apparatus and reduces processing; This image signal processing apparatus has: the 1st smoothing signal generation portion; It carries out the 1st smoothing to said picture signal handles, and generates the 1st smoothing signal that has reduced noise thus; The 2nd smoothing signal generation portion, it carries out handling the 2nd different smoothings with said the 1st smoothing to said picture signal handles, and generates the 2nd smoothing signal that has reduced noise thus; And mixed processing portion, its according to said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal in the corresponding blending ratio of value of any one signal indication, said the 1st smoothing signal and said the 2nd smoothing signal are mixed.
And; The image-signal processing method kind image-signal processing method of another mode of the present invention; The picture signal of being taken by imaging apparatus is carried out noise reduce processing; This image-signal processing method comprises the steps: that said picture signal is carried out the 1st smoothing to be handled, and generates the 1st smoothing signal that has reduced noise thus; Said picture signal is carried out handling the 2nd different smoothings with said the 1st smoothing handle, generate the 2nd smoothing signal that has reduced noise thus; And according to said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal in the corresponding blending ratio of value of any one signal, said the 1st smoothing signal and said the 2nd smoothing signal are mixed.
About the meaning of above-described content and other purposes of the present invention, characteristics, advantage, technical elements and industrial aspect, read following detailed description of the present invention through the contrast accompanying drawing, can access understanding further.
Description of drawings
Fig. 1 is the routine block diagram of overall structure of the camera system of expression execution mode 1.
Fig. 2 is the figure of definite method of the blending ratio in the explanation execution mode 1.
Fig. 3 is another figure of definite method of the blending ratio in the explanation execution mode 1.
Fig. 4 is the figure of definite method of the blending ratio in the variation of explanation execution mode 1.
Fig. 5 is another figure of definite method of the blending ratio in the variation of explanation execution mode 1.
Fig. 6 is the figure of definite method of the blending ratio in other variation of explanation execution mode 1.
Fig. 7 is another figure of definite method of the blending ratio in other variation of explanation execution mode 1.
Fig. 8 is the figure of definite method of the blending ratio in other variation of explanation execution mode 1.
Fig. 9 is another figure of definite method of the blending ratio in other variation of explanation execution mode 1.
Figure 10 is the figure of definite method of the blending ratio in other variation of explanation execution mode 1.
Figure 11 is another figure of definite method of the blending ratio in other variation of explanation execution mode 1.
Figure 12 is the system construction drawing of structure of the computer system in other variation of expression execution mode 1.
Figure 13 is the block diagram of structure of the main part of the computer system in other variation of expression execution mode 1.
Figure 14 is the overall flow figure that is illustrated in other variation of execution mode 1 treatment step that the CPU by computer system carries out.
Figure 15 is the routine block diagram of overall structure of the camera system of expression execution mode 2.
Figure 16 is illustrated in the figure that the noise that uses in the execution mode 2 produces an example of model.
Figure 17 is the figure of an example of expression input signal.
Figure 18 is that expression is applied to input signal shown in Figure 17 with execution mode 2 and the figure of an example of the vision-mix signal that obtains.
Figure 19 is the overall flow figure that is illustrated in the variation of execution mode 2 treatment step that the CPU by computer system carries out.
Embodiment
Below, the image signal processing apparatus that present invention will be described in detail with reference to the accompanying and the preferred implementation of image-signal processing method.In addition, below, the illustration camera system is as image signal processing apparatus of the present invention and image-signal processing method, but the present invention is not limited by this execution mode.
At first, execution mode 1 is described.In execution mode 1, the camera system of having used image signal processing apparatus of the present invention is described.Fig. 1 is the block diagram of the overall structure example of the camera system 1 in the expression execution mode 1.Control part 19 as shown in Figure 1, that the camera system 1 of execution mode 1 has image pickup part 11, image processing part 13, external interface (I/F) portion 15, efferent 17, storage part 18 and controls above-mentioned various piece action.
Image pickup part 11 has imaging apparatuss 113 such as lens combination 111, CCD or CMOS.Lens combination 111 for example is made up of imaging lens system etc., make incident from the photoimaging of being taken the photograph body on imaging apparatus 113.Imaging apparatus 113 for example is on the imaging apparatus of monochrome, the primary color filter of each color of RGB to be carried out Bayer (Bayer) to arrange and the one-board imaging apparatus of formation; Carry out opto-electronic conversion to what receive from the light of being taken the photograph body, generate the picture signal of simulation via lens combination 111.This picture signal is imported into the A/D converter section 131 of image processing part 13.
13 pairs of picture signals from image pickup part 11 inputs of image processing part are carried out various image processing.This image processing part 13 has the 134, the 2nd smoothing signal generation portion 135 of A/D converter section the 131, the 1st image processing part 132, buffer the 133, the 1st smoothing signal generation portion, mixed processing portion 136 and the 2nd image processing part 137.In this image processing part 13, A/D converter section the 131, the 1st image processing part 132, buffer the 133, the 2nd smoothing signal generation portion 135, mixed processing portion 136 and the 2nd image processing part 137 connect according to this in proper order.Buffer 133 also is connected with the 1st smoothing signal generation portion 134 and mixed processing portion 136.And the 1st smoothing signal generation portion 134 is connected with mixed processing portion 136.And, handle like the said various piece in back and the picture signal (RGB picture signal) that obtains from the output of the 2nd image processing part 137, and it inputed to efferent 17 by composing images handling part 13.In addition, in Fig. 1, represent the data signal line of data-signals such as connection and transmitted image signal between the various piece of image processing part 13 is dotted the control signal wire that transmits control signal with solid line.
131 pairs of picture signals from imaging apparatus 113 inputs of A/D converter section are carried out the A/D conversion process, carry out numerical dataizations.Picture signal after the processing is outputed to the 1st image processing part 132.
As the 1st image processing, 132 pairs of the 1st image processing parts for example gain that adjustment is handled and image processing such as white balance correction processing from the picture signals of A/D converter section 131 inputs.In addition, the kind of the image processing of being carried out as the 1st image processing by the 1st image processing part 132 is not limited to these and handles, and also can suitably select required image processing to carry out.Picture signal after the processing is outputed to buffer 133 as input signal.
Buffer 133 is used for interim the preservation by the 1st image processing part 132 and has carried out after the 1st image processing value as the picture signal of input signal output, to upgrading successively from the value of the input signal of the 1st image processing part 132 inputs and preserving.The input signal that is stored in this buffer 133 is read by the 134, the 2nd smoothing signal generation portion 135 of the 1st smoothing signal generation portion and mixed processing portion 136, in the processing of these various pieces, uses.
The value that is stored in the input signal in the buffer 133 is read by the 1st smoothing signal generation portion 134, to this input signal, carries out the 1st smoothing according to every kind of color of RGB and handles.In execution mode 1, handle as the 1st smoothing, the 1st smoothing signal generation portion 134 has for example used the smoothing of average filter etc. and has handled.Picture signal after the processing is outputed to mixed processing portion 136 as the 1st smoothing signal.Here; Average filter is used to calculate the mean value of the pixel value in the predetermined pixel coverage (for example 3 * 3 pixels or 5 * 5 pixels etc.); Handle through using this average filter to carry out smoothing, the fuzzy strongly smoothed image of picture signal (input signal) before generating with respect to handle is handled.
In addition, the smoothing of carrying out about handling as the 1st smoothing is handled, and has been not limited to use the smoothing of average filter to handle.For example, also can use the smoothing of Gaussian filter weighted average filters such as (Gaussian Filter) to handle, handle as the 1st smoothing.
The value that is stored in the input signal in the buffer 133 is read by the 2nd smoothing signal generation portion 135, and different the 2nd smoothing processing is handled in the 1st smoothing that this input signal carries out carrying out with the 1st smoothing signal generation portion 134.In execution mode 1, the 2nd smoothing signal generation portion 135 has used the smoothing of two-sided filter (Bilateralfilter) to handle, and handles as the 2nd smoothing.Picture signal after the processing is outputed to mixed processing portion 136 as the 2nd smoothing signal.
Here; Two-sided filter is used to keep the edge; And the part except that the edge brought the effect of smoothing, and to carry out smoothing and handle through using this two-sided filter, the picture signal (input signal) before generating with respect to handle has kept the smoothing picture signal at edge.In this two-sided filter, for example set two kinds of weights.Particularly, a kind of weight is that margin of image element is more little about the value of the margin of image element of concerned pixel and surrounding pixel, then sets big more weight.Therefore, as the pixel of edge boundary section and surrounding pixel between the bigger pixel of absolute value of margin of image element can be used to smoothing hardly and handle.Thus, can obtain can not make the effect of edge passivation.Another kind of weight is the value about the distance between concerned pixel and the surrounding pixel, and distance is short more, then sets big more weight.That is, the pixel of same pixel value be in closely with situation at a distance under, think compare with remote pixel, the degree of correlation of the pixel value of in-plant pixel is higher, makes bigger weight act on in-plant pixel.This low more hypothesis of the degree of correlation based on distance then pixel value far away (suppose to be in the pixel value difference originally of the pixel of remote same pixel value, but owing to noise sneak into have identical pixel value).Therefore, and the pixel far away of the distance between the surrounding pixel can be used to smoothing hardly and handle.
In addition, the smoothing of carrying out as the 2nd smoothing processing is handled the smoothing that has been not limited to use two-sided filter and is handled.For example, also can use median filter and k edge maintenance filter such as contiguous average filter carry out smoothing and handle, handle as the 2nd smoothing.
Mixed processing portion 136 is according to predetermined blending ratio, to mixing from the 1st smoothing signal of the 1st smoothing signal generation portion 134 inputs and the 2nd smoothing signal of importing from the 2nd smoothing signal generation portion 135.Picture signal after the processing is outputed to the 2nd image processing part 137 as the vision-mix signal.Can the 1st smoothing signal to be mixed and the 2nd smoothing signal blending ratio separately suitably be confirmed as makes it add up to 1 value; In execution mode 1; Confirm blending ratio as follows: in light; The smoothing picture signal that has kept the edge is that the blending ratio of the 2nd smoothing signal is higher, and in the dimness part, the blending ratio that strong fuzzy smoothing picture signal is the 1st smoothing signal is higher.
More specifically, the value that for example is kept at the input signal in the buffer 133 is read by mixed processing portion 136, according to the value of this input signal, confirms blending ratio.Then, according to determined blending ratio, the 1st smoothing signal is mixed with the 2nd smoothing signal.Fig. 2 and Fig. 3 are the figure of definite method of the blending ratio of explanation execution mode 1.Wherein, the value that in Fig. 2, is directed against input signal has been drawn the blending ratio of the 1st smoothing signal, illustrates with curve form.On the other hand, the value that in Fig. 3, is directed against input signal has been drawn the blending ratio of the 2nd smoothing signal, illustrates with curve form.In execution mode 1, like Fig. 2 and shown in Figure 3, use value as the predetermined threshold α of the 1st threshold value, the value of input signal is carried out threshold process.Then, mixed processing portion 136 is the light more than the threshold alpha for the value of input signal, and the blending ratio of the 1st smoothing signal is confirmed as " 0 " regularly, and the blending ratio of the 2nd smoothing signal is confirmed as " 1 " regularly.On the other hand; For the value of the input signal dim part littler than threshold alpha; Confirm the blending ratio of each smoothing signal as follows: when the value of input signal becomes darker more near " 0 "; Then the blending ratio of the 1st smoothing signal is high more, and the blending ratio of the 2nd smoothing signal is low more.
Preestablish the value of the blending ratio of these 1st smoothing signals corresponding and the 2nd smoothing signal, and be stored in the storage part 18 with the value of input signal.For example, the value of storage part 18 storage maps 2 and threshold alpha shown in Figure 3 and the 1st smoothing signal during less than this threshold alpha and the slope of the 2nd smoothing signal blending ratio separately.Perhaps; Also can adopt following structure: prepare look-up table; And be stored in the storage part 18 with the value of threshold alpha, in this look-up table, with the value of setting corresponding the 1st smoothing signal and the 2nd smoothing signal blending ratio separately less than the value of the input signal of threshold alpha accordingly.And; The value of these threshold alpha and can be made as fixed value with value less than the blending ratio of corresponding the 1st smoothing signal of the value of the input signal of threshold alpha and the 2nd smoothing signal; Also can constitute the outside inputs of for example carrying out such as operation input, be set at variable value according to the user.
At this, in execution mode 1,, be to generate the smoothing picture signal that has kept the edge as the 2nd smoothing signal.Therefore, owing to can in bright part, obtain to have kept the high-quality image signal at edge, therefore preferably in the part of dimness, the 1st smoothing signal and the 2nd smoothing signal are mixed, make noise not obvious.Therefore, preferably to a side setting threshold α of dimness.Wherein, this threshold alpha can be set at suitable value.For example, also can set such as Fig. 2 and threshold alpha shown in Figure 3 a bright side ', replace the solid line shown in Fig. 2 and Fig. 3, according to such shown in the single-point line, confirm blending ratio.
If according to the above-mentioned threshold alpha that preestablishes like this; And use this threshold alpha to set blending ratio; Then can adjust the scope (being scope) of the lightness that the 1st smoothing signal and the 2nd smoothing signal are mixed easily in the example of Fig. 2 and Fig. 3, can carry out the higher blending ratio adjustment of the degree of freedom less than threshold alpha.On the other hand, in the dim part of lightness, blending ratio is changed smoothly and set, thereby can obtain can not produce high-quality image signal rapid image quality difference, that do not have inharmonious sense less than this threshold alpha.And, according to user's operation input this threshold alpha is made as variablely if constitute, then the user can carry out browsing/observing of image that the blending ratio according to expectation mixes.
In addition, here illustration confirm the situation of the blending ratio of the 1st smoothing signal and the 2nd smoothing signal according to the value of input signal, but be not limited to this situation.For example, also can confirm blending ratio according to the value of the 1st smoothing signal.Fig. 4 and Fig. 5 are the figure of definite method of the blending ratio of this variation of explanation.Wherein, the value that in Fig. 4, is directed against the 1st smoothing signal has been drawn the blending ratio of the 1st smoothing signal, illustrates with curve form.On the other hand, the value that in Fig. 5, is directed against the 1st smoothing signal has been drawn the blending ratio of the 2nd smoothing signal, illustrates with curve form.In this case, mixed processing portion 136 confirms the 1st smoothing signal and the 2nd smoothing signal blending ratio separately according to the value of the 1st smoothing signal, according to determined blending ratio the 1st smoothing signal and the 2nd smoothing signal is carried out mixed processing.
Perhaps, also can confirm blending ratio according to the value of the 2nd smoothing signal.Fig. 6 and Fig. 7 are the figure of definite method of the blending ratio of this variation of explanation.Wherein, the value that in Fig. 6, is directed against the 2nd smoothing signal has been drawn the blending ratio of the 1st smoothing signal, illustrates with curve form.On the other hand, the value that in Fig. 7, is directed against the 2nd smoothing signal is drawn the blending ratio of the 2nd smoothing signal, illustrates with curve form.In this case, mixed processing portion 136 confirms the 1st smoothing signal and the 2nd smoothing signal blending ratio separately according to the value of the 2nd smoothing signal, according to determined blending ratio the 1st smoothing signal and the 2nd smoothing signal is carried out mixed processing.
And, in definite method of above illustrative blending ratio, be to use a value (α) as threshold value, but also can use plural threshold value.Fig. 8 and Fig. 9 are the figure of definite method of the blending ratio of this variation of explanation.Wherein, the value that in Fig. 8, is directed against the 1st smoothing signal has been drawn the blending ratio of the 1st smoothing signal, illustrates with curve form.On the other hand, the value that in Fig. 9, is directed against the 1st smoothing signal has been drawn the blending ratio of the 2nd smoothing signal, illustrates with curve form.
In this variation, like Fig. 8 and shown in Figure 9, using predetermined threshold value α and the 2nd little threshold value of this threshold alpha of numeric ratio is these two kinds of threshold values of predetermined threshold value β, and the value of the 1st smoothing signal is carried out threshold process.And; Mixed processing portion 136 is for the value of the 1st smoothing signal light bigger than threshold alpha; The 1st smoothing signal and the 2nd smoothing signal blending ratio separately are made as the 1st fixing blending ratio; For example the blending ratio of the 1st smoothing signal is confirmed as " 0 " regularly, the blending ratio of the 2nd smoothing signal is confirmed as " 1 " regularly.On the other hand; For the value of the 1st smoothing signal dim part littler than threshold value beta; The 1st smoothing signal and the 2nd smoothing signal blending ratio separately are made as the 2nd fixing blending ratio; For example the blending ratio of the 1st smoothing signal is confirmed as " 1 " regularly, the blending ratio of the 2nd smoothing signal is confirmed as " 0 " regularly.
Promptly; In this variation, when threshold alpha was above, the blending ratio of the 2nd smoothing signal that in light, will obtain as the high quality graphic that has kept the edge was made as " 1 "; When threshold value beta is following; The blending ratio of the 1st smoothing signal that in dimness part, will obtain as the fuzzy strong and unconspicuous image of noise is made as " 1 ", and the part in the middle of lightness is arranged in their is mixed the 1st smoothing signal and the 2nd smoothing signal.And; For the value of the 1st smoothing signal part in the middle lightness below the threshold alpha and more than threshold value beta; Confirm the blending ratio of each smoothing signal as follows: the value at the 1st smoothing signal is more little and darker; Then the blending ratio of the 1st smoothing signal is high more, and the blending ratio of the 2nd smoothing signal is low more.
More specifically, confirm the blending ratio of the 1st smoothing signal, confirm the blending ratio of the 2nd smoothing signal according to following formula (2) according to following formula (1).
The blending ratio of the 1st smoothing signal
=(value of α-Di 1 smoothing signal)/(alpha-beta) ... (1)
The blending ratio of the 2nd smoothing signal
=(value of the 1st smoothing signal-β)/(alpha-beta) ... (2)
In addition; In this variation; Illustration confirm the situation of the 1st smoothing signal and the 2nd smoothing signal blending ratio separately according to the value of the 1st smoothing signal, but also can confirm blending ratio according to the value of input signal or the value of the 2nd smoothing signal.
And, be not limited to as Fig. 2～Fig. 9 is illustrative to use more than one threshold value to confirm the method for the 1st smoothing signal and the 2nd smoothing signal blending ratio separately, also not setting threshold and definite blending ratio.Figure 10 and Figure 11 are the figure of definite method of the blending ratio of this variation of explanation.Wherein, the value that in Figure 10, is directed against the 1st smoothing signal has been drawn the blending ratio of the 1st smoothing signal, illustrates with curve form.On the other hand, the value that in Figure 11, is directed against the 1st smoothing signal has been drawn the blending ratio of the 2nd smoothing signal, illustrates with curve form.In this case; Confirm the blending ratio of each smoothing signal as follows: in the scope of the desirable value of the 1st smoothing signal; Its value approaches " 0 " more and deepening then improves the blending ratio of the 1st smoothing signal more, and reduces the blending ratio of the 2nd smoothing signal more.In addition; Here illustration confirm the situation of the 1st smoothing signal and the 2nd smoothing signal blending ratio separately according to the value of the 1st smoothing signal; But in this case, also can confirm blending ratio according to the value of input signal or the value of the 2nd smoothing signal.
137 pairs of values from the picture signal of mixed processing portion 136 inputs of the 2nd image processing part are carried out the 2nd image processing.As the 2nd image processing, for example can enumerate image processing such as interpolation processing, color conversion processing, gradation conversion processing, edge detection process, the emphasical processing in edge, false colour reduction processing.In addition, by the 2nd image processing part 137 as the 2nd image processing carry out the image processing kind be not limited thereto, also can suitably select required image processing to carry out.Picture signal after the processing (RGB picture signal) is outputed to efferent 17.
Efferent 17 is made up of display part and recording portion etc.; This display part is according to the picture signal of being imported; The image of being taken by image pickup part 11 (by subject image) is carried out colour to be shown; Or showing the various pictures such as setting picture of the operational environment be used to set camera system 1, this recording portion record is by subject image.Display part is for example realized by display unit such as LCD and EL displays.And recording portion is by realizations such as various recording mediums such as ROM such as the flash memory that can carry out new record more or these various IC memories of RAM, hard disk built-in or that connect through data communication terminals, for example CD-ROM and reading devices thereof.
Exterior I/F portion 15 carries out the handover operation of various patterns such as photograph mode for example, the photograph interface arrangement of handover operation etc. of on/off of setting operation, power supply of photography conditions such as size for example.In addition, user's display part of can be as required constituting efferent 17 through exterior I/15 pairs in F portion is set the indication of the demonstration etc. of picture etc.This exterior I/F portion 15 is for example realized by various functional units such as push-button switch and dial, mouse, touch-screen, these input units of keyboard, will output to control part 19 to the operation signal of these input units.
Control part 19 is electrically connected with the various piece that constitutes camera system 1 through control signal wire, totally controls the action of various piece.Control part 19 is for example handled etc. as follows: the action of control image pickup part 11; In response to user's operation, set the value of various processing parameters, and notice is given various piece via exterior I/F portion 15 inputs.This control part 19 is by the microcomputer that is built-in with memory realizations such as (microprocessors), this memory stores carry out action control and the required various data and the program etc. of various piece.
As stated; According to execution mode 1, can use the for example smoothing of average filter to handle to input signal, generate the 1st smoothing signal; And used the for example smoothing of two-sided filter to handle to input signal, generated the 2nd smoothing signal.And, for example can carry out mixed processing to the 1st smoothing signal and the 2nd smoothing signal according to the blending ratio corresponding with input signal.Thus, can mix fuzzy sense two the smoothing signals different respectively with the edge reserved state.
More specifically; In execution mode 1; Can in light, improve the blending ratio of the 2nd smoothing signal that obtains as the high-quality smoothing picture signal that has kept the edge; In dimness part, improve the blending ratio of the 1st smoothing signal that obtains as the fuzzy strong and unconspicuous smoothing picture signal of noise, the 1st smoothing signal and the 2nd smoothing signal are mixed.Thus, in light, utilize the 1st smoothing signal kept the edge to keep resolution, strengthened the 1st fuzzy smoothing signal and make noise not obvious and in the dimness part, utilize.Therefore; Even under the brighter situation of image or under the relatively dimer situation, bright image memory under the situation of dimness part or under the situation of image memory in dimness at light, inferior in the situation of light and dim partially mixed existence; Also can suppress to occur noise and reduce the relatively poor part of effect, on integral image, obtaining preferably, noise reduces effect.
And, through the adjustment blending ratio, can obtain the picture signal of various edges reserved state, thereby the user that browses/observe picture signal can be provided the image of desired image quality.For example, in the 1st execution mode, carry out in combination that noise for the picture signal of dimness reduces that effect the 1st smoothing is preferably handled and reduce effect the 2nd smoothing preferably for the noise of bright picture signal and handle.Therefore; For example think at length to browse/observe under the situation at dim position in the situation that camera system 1 is applied to endoscope suchly; The noise that can improve for the image of dimness reduces the effect blending ratio of the 1st smoothing signal preferably; Under the situation of thinking at length to browse/observe bright position, the noise that can improve for bright image reduces the effect blending ratio of the 2nd smoothing signal preferably.
In addition, the combination of being handled by the 1st smoothing signal generation portion 134 the 1st smoothing processing of carrying out and the 2nd smoothing of being undertaken by the 2nd smoothing signal generation portion 135 of explanation does not have particular determination in execution mode 1.For example, also can adopt following structure: two kinds of smoothing treatment combinations during the smoothing that will use above-mentioned average filter, two-sided filter, Gaussian filter, median filter, the most contiguous average filter of k and differential filter and trilateral filter, the predetermined direction in edge to carry out the known filters such as direction dependent form filter of 1 dimension smoothing processing is handled.And; Can also the smoothing after these combinations be handled as the 1st smoothing of being undertaken by the 1st smoothing signal generation portion 134 and handle and handle, its result mixed by mixed processing portion 136 by the 2nd smoothing that the 2nd smoothing signal generation portion 135 carries out.
And, in execution mode 1, be illustrated by the camera system of subject image using image pickup part 11 shootings to be taken the photograph body and export, be not limited to this camera head that comprises imaging apparatus by the device after integrated but can use device of the present invention.For example, can be applied to equally import by the camera head shot image signals of split and the image signal processing apparatus of handling from the outside.For example, in this image signal processing apparatus, also can be via recording medium movably or by the external equipment that communicates connection, from outside received image signal, and to this picture signal and carry out image processing.
And, in execution mode 1, illustration adopt the situation of the imaging apparatus 113 of single plate structure as image pickup part 11.Relative therewith, also can adopt the imaging apparatus of three plate structures to constitute image pickup part 11 with prism etc., this prism is separated into incident light the color of light of the wavelength band of each color of RGB.And, be not limited to handle the situation of color picture signal, equally also can be applied to monochromatic picture signal.
And in execution mode 1, the various piece of composing images handling part 13 is made up of hardware, but is not limited to this mode.For example, also can constitute by CPU and carry out the processing that various piece is carried out,, realize as software thus by the CPU executive program.Perhaps, also can utilize software to constitute the part of the processing that various piece carries out.
Camera head is being made as under the situation that processing split type, that the various piece of image processing part 13 is carried out realizes as software, can be with known computer systems such as work station and computers as image signal processing apparatus.And, prepare the program (image signal processing program) of the processing that the various piece that is used to realize image processing part 13 carries out in advance, carry out this image signal processing program through CPU and realize by computer system.
Figure 12 is the system construction drawing of structure of the computer system 200 of this variation of expression, and Figure 13 is the block diagram of structure of the main part 210 of this computer system 200 of expression.Shown in figure 12, computer system 200 has: main part 210; Display 220, it is according to the indication from main part 210, information such as display image in display frame 221; Keyboard 230, it is to the various information of these computer system 200 inputs; And mouse 240, the optional position in the display frame 221 of its designated display 220.
And like Figure 12 and shown in Figure 13, the main part 210 of this computer system 200 has: CPU211; RAM212; ROM213; Hard disk drive (HDD) 214; Accept the CD-ROM drive 215 of CD-ROM260; The USB port 216 that can connect USB storage 270 with plugging; Display 220; The I/O interface 217 that connects keyboard 230 and mouse 240; The LAN interface 218 that is connected with local area network (LAN) or wide area network (LAN/WAN) N1.
In addition; The modulator-demodulator 250 that this computer system 200 and being used to is connected public line N3 such as internet connects, simultaneously via LAN interface 218 and local area network (LAN) or wide area network N1 be connected as the computer (PC) 281 of other computer systems, server 282, printer 283 etc.
And; This computer system 200 (for example reads out in the predetermined recording media images recorded signal handler; Be used to be implemented in the image signal processing program of back with reference to the treatment step of Figure 14 explanation) and carry out this program, realize image signal processing apparatus thus.Wherein, Predetermined recording media is meant all recording mediums of the image signal processing program that logger computer system 200 can read, comprising: " the removable physical medium " that comprises CD-ROM260, USB storage 270 and MO dish and DVD dish, floppy disk (FD), photomagneto disk, IC-card etc.; In the inside of computer system 200 or HDD214 or RAM212, the ROM213 etc. " fixed physical medium " of outer setting; Public line N3, other computer systems (PC) 281 that connect via modulator-demodulator 250 or local area network (LAN) that server 282 connected or wide area network N1 etc. are when router stored program in short time " communication media " etc.
Promptly; Image signal processing program is recorded in the recording mediums such as " removable physical medium ", " fixed physical medium ", " communication media " with the mode that computer can read; Computer system 200 is read image signal processing program and is carried out this program from this recording medium, realize image signal processing apparatus thus.In addition; Image signal processing program is not limited to the mode by computer system 200 execution; Under by the situation of other computer systems (PC) 281 or server 282 carries out image signal handlers or under the situation of computer system (PC) 281 and server 282 cooperation ground carries out image signal handlers, can use the present invention equally.
Figure 14 is the overall flow figure that is illustrated in this variation the treatment step that the CPU211 by computer system 200 carries out.In addition, the processing of explanation here is through being realized by CPU211 execution images recorded signal handler in above-mentioned predetermined recording media.
Shown in figure 14, at first, CPU211 for example via the movable-type physical medium, or from communicating the external equipment of connection, the picture signal (step a1) that the camera head that input is made up of the imaging apparatus that utilizes one-board is taken.Then, CPU211 at first carries out the 1st image processing (step a3) to the value of the picture signal of in step a1, importing.Then, the picture signal of CPU211 after to the 1st image processing for example used the 1st smoothing of average filter to handle, and generates the 1st smoothing signal (step a5).And the picture signal of CPU211 after to the 1st image processing for example used the 2nd smoothing of two-sided filter to handle, and generates the 2nd smoothing signal (step a7).Then, CPU211 carries out mixed processing according to predetermined blending ratio to the 1st smoothing signal that in step a5, generates and the 2nd smoothing signal that in step a7, generates, and generates vision-mix signal (step a9).The blending ratio of the 1st smoothing signal and the 2nd smoothing signal is to confirm according to the value of any one signal in input signal, the 1st smoothing signal and the 2nd smoothing signal with execution mode 1 identically.
Then, CPU211 carries out the 2nd image processing (step a11) to the vision-mix signal.Then, CPU211 carries out the processing (step a13) with the picture signal after the 2nd image processing (RGB picture signal) output.For example, carry out the picture signal after the 2nd image processing is outputed to the processing that the display 220 shown in Figure 14 etc. shows, perhaps carry out the processing of the picture signal record after the 2nd image processing in USB storage 270 media such as booking situation such as grade.
Execution mode 2
Below, execution mode 2 is described.Figure 15 is the routine block diagram of overall structure of the camera system 1b of expression execution mode 2.In addition, to the structure mark identical label identical with the structure of explanation in execution mode 1.Control part 19b shown in figure 15, that the camera system 1b of execution mode 2 has image pickup part 11b, image processing part 13b, exterior I/F portion 15, efferent 17, storage part 18b and controls the action of above-mentioned various piece.
Identical with execution mode 1, image pickup part 11b has imaging apparatus 113b such as lens combination 111, CCD or CMOS.In execution mode 2, imaging apparatus 113b is made as monochromatic imaging apparatus, generate monochromatic picture signal, it is outputed to the A/D converter section 131 of image processing part 13b.
Image processing part 13b has A/D converter section the 131, the 1st image processing part 132, buffer 133b, the 1st smoothing signal generation 134b of portion, the 2nd smoothing signal generation 135b of portion, the 136b of mixed processing portion and the 2nd image processing part 137.The 2nd smoothing signal generation 135b of portion comprises that noisiness estimating section 138b and noise reduce handling part 139b.In this image processing part 13b, A/D converter section the 131, the 1st image processing part 132, buffer 133b, the 1st smoothing signal generation 134b of portion, noisiness estimating section 138b, noise reduce handling part 139b, mixed processing portion 136 and the 2nd image processing part 137 connects according to this in proper order.Buffer 133b also reduces handling part 139b with noise and is connected.And the 1st smoothing signal generation 134b of portion also reduces handling part 139b with noise and mixed processing portion 136 is connected.And, handle like the said various piece in back and the monochromatic image signal that obtains from the output of the 2nd image processing part 137, and be input to efferent 17 by composing images handling part 13b.
In execution mode 2; Buffer 133b is used for interim the preservation by the 1st image processing part 132 and has carried out after the 1st image processing value as the picture signal of input signal output, to upgrading successively from the value of the input signal of the 1st image processing part 132 inputs and preserving.Be stored among this buffer 133b input signal by the 1st smoothing signal generation portion 134, and noise reduce handling part 139b and read, and in the processing of these various pieces, use.
The 1st smoothing signal generation 134b of portion reads the value that is stored in the input signal among the buffer 133b, this input signal is carried out the 1st smoothing handle.In execution mode 2, the 1st smoothing signal generation 134b of portion has for example used the smoothing of two-sided filter etc. to handle, and handles as the 1st smoothing.Picture signal after the processing is outputed to the 136b of mixed processing portion as the 1st smoothing signal.
In addition, the smoothing of carrying out about handling as the 1st smoothing is handled, and has been not limited to use the smoothing of two-sided filter to handle, and also can suitably use the smoothing of known filter to handle.
The noisiness estimating section 138b that constitutes the 2nd smoothing signal generation 135b of portion uses the gain adjustment value to the picture signal of importing from image pickup part 11b, produces model according to predetermined noise, estimates the noisiness that comprises in the 1st smoothing signal.Estimated noisiness is outputed to noise and is reduced handling part 139b.In addition, gain adjustment value is imported from control part 19b.Figure 16 is illustrated in the figure that the noise that uses in the execution mode 2 produces an example of model, in Figure 16, has drawn noisiness to image signal value, illustrates with curve form.This noise produces model and obtains carrying out modeling with the relevant generating noise amount of using of imaging apparatus 113b, is to be formed and stored in advance among the storage part 18b.When the actual estimated noisiness, noisiness estimating section 138b produces model with reference to this noise, and the image signal value of transverse axis as the 1st image signal value, is obtained corresponding noisiness.Then, noisiness estimating section 138b uses gain adjustment value, estimates according to the noisiness of being obtained.
And; The noise that constitutes the 2nd smoothing signal generation 135b of portion reduces handling part 139b and reads the value that is stored in the input signal among the buffer 133b; According to from the noisiness of noisiness estimating section 138b input and the 1st smoothing signal of importing from the 1st smoothing signal generation 134b of portion, input signal is carried out noise reduce processing.Picture signal after the processing is outputed to the 136b of mixed processing portion as the 2nd smoothing signal.
In execution mode 2, noisiness estimating section 138b carries out coring (coring) to input signal to be handled.Particularly, at first obtain the value of input signal and the difference value of the 1st smoothing signal, difference value of being obtained and noisiness are compared.And, for the difference value part littler, this difference value is judged to be noise than noisiness, the value of the 1st smoothing signal is exported as the value of the 2nd smoothing signal.On the other hand; For difference value is the part more than the noisiness; The part suitable with noisiness in the difference value is judged to be noise, will carries out addition, export the signal value that addition obtains as the value of the 2nd smoothing signal from value and the 1st smoothing signal that difference value deducts behind the noisiness.In the 2nd smoothing picture signal, be not to be judged as noise and the part that is judged as the edge for the coring process result, keep the value of input signal to a certain extent.
The 136b of mixed processing portion is according to predetermined blending ratio, to carrying out mixed processing from the 1st smoothing signal of the 1st smoothing signal generation 134b of portion input and the 2nd smoothing signal of importing from the 2nd smoothing signal generation 135b of portion.About the 1st smoothing signal and the 2nd smoothing signal blending ratio separately, for example be employed in the execution mode 1 definite method of explaining as variation with reference to Fig. 4 and Fig. 5 and confirm.But, also can utilize other to confirm that method confirms.That is, also can suitably adopt definite method of explaining with reference to Fig. 2, Fig. 3, Fig. 6～Figure 11 to confirm the 1st smoothing signal and the 2nd smoothing signal blending ratio separately.Picture signal after the processing is outputed to the 2nd image processing part 137 as the vision-mix signal.
Figure 17 is the figure of an example of expression input signal.On the other hand, Figure 18 is that expression is applied to the input signal of Figure 17 with execution mode 2 and the figure of an example of the vision-mix signal that obtains.Wherein, following image has been shown in Figure 17: towards Figure 17 the time, with respect to the zone in left side, right side regional brighter compared with the zone on right side, and noise is higher in the zone in left side.When execution mode 2 being applied to this image shown in Figure 17, shown in figure 18, in Figure 17, in the zone in the higher left side of noise ratio, also reduced noise accurately, can obtaining on the whole, noise reduces effective image.
As stated,, can for example use the smoothing of two-sided filter to handle, generate the 1st smoothing signal input signal according to execution mode 2.On the other hand, generate the noise that obtains carrying out modeling in advance and produce model, estimate the noisiness that comprises in the 1st smoothing signal according to this noise generation model with the relevant generating noise amount of using of imaging apparatus 113b.And, according to estimated noisiness, input signal is carried out noise reduce processing, generate the 2nd smoothing signal.And, for example can according to the corresponding blending ratio of the 1st smoothing signal, the 1st smoothing signal and the 2nd smoothing signal are carried out mixed processing.Therefore, can mix to the 1st smoothing signal that obtains as the smoothing picture signal that has kept the edge with according to having carried out the 2nd smoothing signal that noise reduces after the processing with the corresponding generating noise frequency of imaging apparatus 113b that uses.
More specifically, be to estimate the noisiness that comprises in the 1st smoothing signal and carry out noise reduction processing, generate the 2nd smoothing signal, thereby can preserving edge when carrying out the noise reduction.And, the use of carrying out handling as the 1st smoothing during the smoothing of two-sided filter handles, keep the range information between pixel according to that kind of explanation in execution mode 1, thereby the noise that can realize having embodied range information reduces and handles.Therefore; The 2nd smoothing signal after preserving edge and the noise that embodied range information reduce handled and mix according to the 1st smoothing signal that obtains as the smoothing picture signal that has kept the edge noted earlier can be considered range information and marginal information thus, carried out the noise reduction evenly.Thus, can suppress to occur noise and reduce the relatively poor part of effect, obtain the effect of noise reduction preferably on the whole, high-quality image can be provided.
And, handle as the 2nd smoothing, be to carry out coring to handle.Therefore; Be judged to be the part smoothed of noise; Be judged to be and be not noise but the part at edge still is left the edge; Thereby the part that is judged to be the edge shows as isolated point easily, but through the 2nd smoothing signal is mixed with the 1st smoothing signal, can relax the noise that keeps as above-mentioned isolated point.
In addition, the image processing part 13b for execution mode 2 is not limited to situation about being made up of hardware with execution mode 1 identically.That is, can realize as software through CPU211 carries out image signal handler by Figure 12 and the illustrative computer system 200 of Figure 13.
Figure 19 is the overall flow figure that is illustrated in the treatment step that is undertaken by CPU211 in this variation.Shown in figure 19, at first, CPU211 for example via removable physical medium, or from communicating the external equipment of connection, input is by the camera head shot image signals (step b1) of utilizing monochromatic imaging apparatus to constitute.Then, CPU211 at first carries out the 1st image processing (step b3) to the value of the picture signal in step b1, imported.Then, the picture signal of CPU211 after to the 1st image processing for example used the 1st smoothing of two-sided filter to handle, and generates the 1st smoothing signal (step b5).
Then, CPU211 produces model according to predetermined noise and carries out noisiness estimation processing, estimates the noisiness (step b7) that comprises in the 1st smoothing signal.The noise that in this processing, uses produces model and is stored in advance among the ROM213 for example shown in Figure 13 etc.Then, CPU211 carries out noise reduction processing such as for example coring processing according to noisiness of in step b7, estimating and the 1st smoothing signal that in step b5, generates to the picture signal of in step b1, importing, generate the 2nd smoothing signal (step b8).Then, CPU211 carries out mixed processing according to predetermined blending ratio to the 1st smoothing signal that in step b5, generates and the 2nd smoothing signal that in step b7, generates, and generates vision-mix signal (step b9).The blending ratio of the 1st smoothing signal and the 2nd smoothing signal is to confirm according to the value of any one signal in input signal, the 1st smoothing signal and the 2nd smoothing signal with execution mode 1 identically.
Then, CPU211 carries out the 2nd image processing (step b11) to the vision-mix signal.Then, CPU211 carries out the processing (step b13) with the output of the picture signal after the 2nd image processing.For example, carry out the picture signal after the 2nd image processing is outputed to the processing that display shown in Figure 13 220 shows, perhaps carry out the processing of the picture signal record after the 2nd image processing in USB storage 270 media such as booking situation such as grade.
And, in execution mode 2 illustration use the situation of monochromatic imaging apparatus 113b as image pickup part 11b, but be not limited to handle the situation of monochromatic picture signal, equally also can be applied to color picture signal.That is, also can the structure of image pickup part 11b be made as the structure of the imaging apparatus 113 that adopts the single plate structure shown in the execution mode 1, can also adopt the imaging apparatus of three plate structures to constitute image pickup part 11b.
And, the invention is not restricted to above-mentioned two kinds of execution modes 1,2 and variation thereof, can in the scope that does not break away from inventive concept, be out of shape and practical implementation inscape.And,, can form various inventions through above-mentioned each execution mode 1,2 of appropriate combination and the disclosed a plurality of inscapes of variation thereof.For example, can from all inscapes of each execution mode 1,2 and variation record, delete several inscapes.In addition, the inscape of also can appropriate combination in different embodiment and variation, explaining.Like this, can in the scope that does not break away from inventive concept, carry out various distortion and application.
As stated, image signal processing apparatus of the present invention, image signal processing program and image-signal processing method are suitable for suppressing to occur noise and reduce the relatively poor part of effect, and on integral image, obtaining preferably, noise reduces effect.
Those skilled in the art can derive effect and variation further easily.Therefore, execution mode widely of the present invention be not limited to as above to explain and record and narrate specific in detail and representational execution mode.Therefore, can under situation about not breaking away from, carry out various changes by the spirit of the notion of the invention of the blanket formula of subsidiary claims and equivalent definition thereof or scope.
Claims (9)
1. image signal processing apparatus, it carries out noise to the picture signal of being taken by imaging apparatus and reduces and handle, and this image signal processing apparatus has:
The 1st smoothing signal generation portion, it carries out the 1st smoothing to said picture signal handles, and generates the 1st smoothing signal that has reduced noise thus;
The 2nd smoothing signal generation portion, it carries out handling the 2nd different smoothings with said the 1st smoothing to said picture signal handles, and generates the 2nd smoothing signal that has reduced noise thus; And
Mixed processing portion, its according to said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal in the corresponding blending ratio of value of any one signal indication, said the 1st smoothing signal and said the 2nd smoothing signal are mixed.
2. image signal processing apparatus according to claim 1, wherein,
Said the 2nd smoothing signal generation portion has:
The noisiness estimating section, its basis produces model and said the 1st smoothing signal, estimating noise amount with the predefined explicitly noise of said imaging apparatus; And
Noise reduces handling part, and it carries out noise to said picture signal and reduce processing according to said noisiness and said the 1st smoothing signal.
3. image signal processing apparatus according to claim 1, wherein,
Said the 1st smoothing signal generation portion has used the smoothing of two-sided filter to handle to said picture signal, handles as said the 1st smoothing.
4. image signal processing apparatus according to claim 1 is characterized in that,
The value of any one signal indication is more little in said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal; Then said mixed processing portion improves the blending ratio of said the 1st smoothing signal more and mixes; The value of any one signal indication is big more described in said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal, and then said mixed processing portion improves the blending ratio of said the 2nd smoothing signal more and mixes.
5. image signal processing apparatus according to claim 4, wherein,
Be the 1st predetermined threshold value when above in the value of any one signal indication described in said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal, said mixed processing portion is mixed said the 1st smoothing signal and said the 2nd smoothing signal according to predetermined blending ratio.
6. image signal processing apparatus according to claim 4, wherein,
Be the 1st predetermined threshold value when above in the value of any one signal indication described in said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal; Said mixed processing portion is mixed said the 1st smoothing signal and said the 2nd smoothing signal according to the 1st blending ratio; Be the 2nd predetermined threshold value when following in the value of any one signal indication described in said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal; Said mixed processing portion is mixed said the 1st smoothing signal and said the 2nd smoothing signal according to the 2nd blending ratio; Wherein, the 2nd threshold value＜the 1st threshold value.
7. image signal processing apparatus according to claim 5, wherein,
Said the 1st threshold value is set to the smaller value of the value of any one signal indication in said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal in the dim side of image.
8. image signal processing apparatus according to claim 1 is characterized in that, said the 2nd smoothing signal generation portion carries out the reservation effect at edge and handles better smoothing processing than said the 1st smoothing.
9. an image-signal processing method carries out noise to the picture signal of being taken by imaging apparatus and reduces processing, and this image-signal processing method comprises the steps:
Said picture signal is carried out the 1st smoothing handle, generate the 1st smoothing signal that has reduced noise thus;
Said picture signal is carried out handling the 2nd different smoothings with said the 1st smoothing handle, generate the 2nd smoothing signal that has reduced noise thus; And
According to said picture signal, said the 1st smoothing signal and said the 2nd smoothing signal in the corresponding blending ratio of value of any one signal, said the 1st smoothing signal and said the 2nd smoothing signal are mixed.
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Application publication date: 20120919 |