WO2005029848A1 - Electronic camera and method with fill flash function - Google Patents

Electronic camera and method with fill flash function Download PDF

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Publication number
WO2005029848A1
WO2005029848A1 PCT/US2004/030002 US2004030002W WO2005029848A1 WO 2005029848 A1 WO2005029848 A1 WO 2005029848A1 US 2004030002 W US2004030002 W US 2004030002W WO 2005029848 A1 WO2005029848 A1 WO 2005029848A1
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WO
WIPO (PCT)
Prior art keywords
photocell
image capture
flash unit
light energy
camera
Prior art date
Application number
PCT/US2004/030002
Other languages
French (fr)
Inventor
Norman D. Staller
Original Assignee
Polaroid Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polaroid Corporation filed Critical Polaroid Corporation
Priority to DE602004006762T priority Critical patent/DE602004006762T2/en
Priority to JP2006526397A priority patent/JP4418467B2/en
Priority to EP04784006A priority patent/EP1665777B1/en
Publication of WO2005029848A1 publication Critical patent/WO2005029848A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means

Definitions

  • the present invention generally relates to electronic image capture and particularly to a fill flash function for such electronic image capture.
  • Electronic imaging devices such as those used in digital cameras, typically perform image capture differently from film based cameras.
  • Electronic image capture devices typically integrate separate output signals from each photosensitive semiconductor pixel of an array of pixels.
  • An image capture is typically initiated by simultaneously zeroing all of the integration values of the pixels, and various approaches have been used for terminating the image capture process. Such integrated values then need to be read out from each of the array pixels. Problems occur in controlling the amount of time over which each of the pixels continues to integrate sensed light signals.
  • Controlling the integration of such imaging devices is further complicated by the attempt to control a fill flash function, wherein a flash unit is used for part of the illumination of a scene including a near field object of limited brightness and a far field background of greater brightness.
  • a flash unit is used for part of the illumination of a scene including a near field object of limited brightness and a far field background of greater brightness.
  • Such image capture and pixel integration is still further complicated by the additional need to achieve the proper balance of illumination between natural and artificial, or flash, light sources.
  • One embodiment of the present invention provides an electronic camera, including an electronic image capture device adapted for capturing an image scene, a scanning aperture shutter located to control light energy received by the electronic image capture device from the image scene, a photocell adapted for sensing light energy received from the image scene, and an exposure control system responsive to the photocell and operatively connected to the scanning aperture shutter, wherein the exposure control system is adapted to control the scanning aperture shutter and a flash unit in response to sensed light energy at the photocell to control an amount of fill flash energy in relation to ambient light energy received by the electronic image capture system during image capture.
  • the exposure control system may be adapted to illuminate the flash unit once a predetermined amount of ambient light energy is sensed by the photocell, and also to extinguish the flash unit once a predetermined amount of infrared spectrum energy is sensed by the photocell during flash unit illumination.
  • the photocell may include a visible spectrum photocell and an infrared spectrum photocell, and the exposure control system may adapted to use the visible spectrum photocell to sense ambient light energy received from the image scene prior to illumination by the flash unit and to use the infrared photocell for sensing infrared spectrum energy received from the image scene during illumination by the flash unit.
  • the scanning aperture shutter may include separate apertures for the image capture device, the visible spectrum photocell and the infrared spectrum photocell.
  • the exposure control system may be adapted to generate control signals for a detachable flash unit, or the flash unit may be constructed integrally with the camera.
  • Another embodiment of the present invention includes an electronic image capture device adapted for capturing an image scene, a scanning aperture shutter located to control light energy received by the image capture device, a flash unit oriented to illuminate the image scene, a photocell unit adapted for sensing visible spectrum energy and infrared spectrum energy received from the image scene, and an exposure control system responsive to the photocell unit and operatively connected to the scanning aperture shutter and the flash unit, wherein the exposure control system is adapted to control an amount of fill flash energy received from the image scene in relation to visible ambient light energy received from the image scene during image capture by illuminating the flash unit once a predetermined amount of ambient visible spectrum energy is sensed by the photocell unit and by extinguishing the flash unit once a predetermined amount of infrared energy is sensed by the photocell unit.
  • the visible spectrum and infrared spectrum photocells may be separate devices, and the shutter may include separate, proportionately operable, variable apertures for the image capture device and the photocell unit. Also, the flash unit may be a quenchable strobe light.
  • Yet another embodiment of the present invention provides a method for electronic image capture using a fill flash function, comprising the steps of using a scanning aperture shutter to control light energy received by an electronic image capture device, sensing visible ambient light energy and infrared energy received from an image scene, and controlling the scanning aperture shutter and a flash unit during image capture in response to the sensing to cause a predetermined ratio of fill flash light energy to ambient light energy to be received by the electronic image capture device including illuminating the flash unit once a predetermined amount of ambient light energy is sensed during image capture.
  • the step of sensing may use an infrared spectrum photocell for sensing infrared energy received from the image scene during illumination by the flash unit, and further may use a visible light spectrum photocell for sensing ambient light energy received from the image scene before illumination by the flash unit.
  • the step of controlling may include extinguishing the flash unit once a predetermined amount of infrared spectrum energy is sensed during flash unit illumination.
  • scanning aperture shutter may include separate, proportionately operable, variable apertures for image capture and the step of sensing.
  • FIG. 1 is a representational side view diagram of an electronic camera constructed in accordance with one embodiment of the present invention as it would be used for image capture;
  • FIG. 2 is a representational front view of a blade shutter suitable for use with the camera of Fig. 1;
  • FIG. 3 is a representational front view of another blade shutter suitable for use with the camera of Fig. 1;
  • Fig. 4 is a graph of light energy captured by the camera of Fig. 1, verses time.
  • FIG. 1 shows an electronic camera 10 generally including an electronic image capture device 12, a scanning aperture shutter 14, imaging optics 16, a photocell 18 and an exposure control system 20. Attached to camera 10 is a removable flash unit 22. Camera 10 forms an electronic image capture system by using imaging optics 16, such as a lens, to focus an image scene of received light from a field of view 24, on image capture device 12. Scanning aperture shutter 14 is located between imaging optics 16 and image capture device 12 to control the amount of image light received by image capture device 12.
  • Photocell 18 is directed to sense light energy received from a substantially similar field of view 26, as determined by a separate optical element 28. Light energy received by photocell 18 passes through, and is likewise controlled by shutter 14.
  • Exposure control system 20 is coupled to photocell 18 and is adapted to responsively control shutter 14 and image capture device 12 to control the amount of light energy received from flash unit 22 during image capture.
  • Image capture device 12 may be constructed in any suitable manner, such as in the form of a CCD, which is the best available embodiment at the time of this application. Also, although flash unit 22 is shown as a removable attachment to camera 10, it may also be constructed as an integral part of camera 10, as represented by phantom lines 23.
  • an image scene 30 may include a near-field object 32 set against a far-field background 34, wherein the natural illumination of far-field background 34 is greater than that of near-field object 32.
  • a fill flash function is used to provide greater illumination to the near-field object 32 and thereby balance the lighting of the entire photo for better composition. Fill flash is even more frequently used to minimize shadow areas in near field objects.
  • exposure control system 20 is adapted to control the amount of fill flash energy received from flash unit 22 in relation to ambient light energy received during an image capture.
  • FIG. 2 is a representational front view of one form of scanning aperture shutter 14, called a blade shutter, which may be used with the camera 10 (Fig. 1).
  • Shutter 14 typically includes a pair of rigid shutter blades 40, 42, which are adapted for relative lateral movement in the direction of arrows 44 by means of an electromechanical actuator 45.
  • Front blade shutter 40 includes apertures 46, 48, and rear blade shutter 42 includes apertures 47, 49, shown in phantom.
  • Aperture pair 46, 47 are intended for image capture and are aligned with image capture device 12 (Fig . 1).
  • Aperture pair 48, 49 are intended for exposing photocell 18 (Fig . 1) to incident image light energy and are therefore intended to be aligned with photocell 18.
  • shutter 14 includes separate, proportionately operable, variable apertures 46, 47 and 48, 49 for image capture device 12 and photocell 18.
  • Fig. 3 shows a front view of another pair of blade shutters 50, 52, which include an aperture pair 54, 55 for image capture and separate aperture pairs 56, 57 and 58, 59 to accommodate a visible spectrum photocell 60 and an infrared spectrum photocell 62, respectively.
  • Aperture pair 56, 57 are associated with a monitoring aperture pair 64, which is shown as a single aperture, but is actually a separate aperture in each aperture blade 50, 52.
  • Monitoring aperture pair 64 is designed to be open while aperture pair 54, 55 is closed to allow ambient light monitoring of an image scene prior to image capture.
  • Both aperture pairs 56, 57 and 58, 59 are shaped to provide an analogous representation of the opening of image capture aperture pair 54, 55.
  • the relative orientation of the aperture pairs varies between Figs. 2 and 3 as the orientation of image capture device 12 and photocell 18 may vary in the embodiment of Fig. 1.
  • Fig. 4 is a graph, over the exposure time of an image capture, of the amount of light energy admitted through image capture aperture pair 46, 47 (Fig. 2) to thereby form an image on image capture device 12 (Fig. 1).
  • Fig. 4 represents the operation of camera 10 (Fig . 1) in the fill flash mode, wherein the total light energy used for image capture is a mixed proportion of ambient scene illumination and fill flash.
  • photocell 18 senses an analogous amount of received light during image capture.
  • the area 70, 72 under the graph represents the amount of light energy received over time.
  • exposure control system 20 can determine, in real time, the amount of image capture light energy incident upon image capture device 12.
  • a well known fill flash function typically uses ambient scene illumination to provide approximately 75% of the image capture light energy and the fill flash function to provide the remaining 25 % of image capture energy. This distribution may be varied by image scene. For controlling this distribution, exposure control system 20 monitors and integrates the output of photocell 18 until the integrated area 70 under curve 68 reaches approximately 70% of the necessary amount of image capture light energy.
  • flash unit 22 is illuminated and the amount of incident light energy sensed by photocell 18 increases, very steeply.
  • exposure control system 20 determines that 90 to 95% of the desired image capture light energy has been received and exposure control system 20 quenches flash 22 and closes shutter 14.
  • flash unit 22 may have a variable light output, and exposure control system 20 may be adapted to limit such variable light output in response to light energy sensed by photocell 18.
  • the rising slope of the left side of curve 68 represents the increasing aperture size of a scanning aperture shutter. It can be appreciated, that in low-light image scenes, the scanning aperture shutter may open to its maximum aperture before approximately 70% of the image capture energy has been sensed or received.
  • exposure control system 20 may be programmed to illuminate flash unit 22 to allow the 25% flash contribution to be collected.
  • Shutter 14 may subsequently be left open after flash unit 22 is quenched, so that ambient light is further admitted to reach the preferred distribution.
  • Ambient light received during flash illumination may not be measurable because of visible spectrum flash illumination, but it may be factored into the measurement.
  • the present invention preferably uses an infrared photocell for measuring image scene energy during flash illumination, and those measurements are converted to appropriate visible spectrum values or otherwise factored into the overall light measurement in accordance with methods known in the art.
  • the art of exposure control devices for cameras is well developed, and various physically different devices may be constructed in accordance with known methods to implement the functions of the exposure control system of the present invention.

Abstract

A method and camera for electronic image capture provide an electronic image capture device, a scanning aperture shutter located to control light energy received by the image capture device, a flash unit oriented to illuminate an image scene, a photocell unit adapted for sensing visible spectrum energy and infrared spectrum energy received from the image scene, and an exposure control system responsive to the photocell unit and operatively connected to the scanning aperture shutter and the flash unit. The exposure control system is adapted to control an amount to fill flash energy received from the image scene in relation to visible ambient light energy received from the image scene during image capture by illuminating the flash unit once a predetermined amount of ambient visible spectrum energy is sensed by the photocell unit and by extinguishing the flash unit once a predetermined amount of infrared energy is sensed by the photocell unit.

Description

ELECTRONIC CAMERA AND METHOD WITH FILL FLASH FUNCTION
Field of the Invention
[0001] The present invention generally relates to electronic image capture and particularly to a fill flash function for such electronic image capture.
Background of the Invention [0002] Electronic imaging devices, such as those used in digital cameras, typically perform image capture differently from film based cameras. Electronic image capture devices typically integrate separate output signals from each photosensitive semiconductor pixel of an array of pixels. An image capture is typically initiated by simultaneously zeroing all of the integration values of the pixels, and various approaches have been used for terminating the image capture process. Such integrated values then need to be read out from each of the array pixels. Problems occur in controlling the amount of time over which each of the pixels continues to integrate sensed light signals.
[0003] Controlling the integration of such imaging devices is further complicated by the attempt to control a fill flash function, wherein a flash unit is used for part of the illumination of a scene including a near field object of limited brightness and a far field background of greater brightness. Such image capture and pixel integration is still further complicated by the additional need to achieve the proper balance of illumination between natural and artificial, or flash, light sources.
Summary of the Invention [0004] One embodiment of the present invention provides an electronic camera, including an electronic image capture device adapted for capturing an image scene, a scanning aperture shutter located to control light energy received by the electronic image capture device from the image scene, a photocell adapted for sensing light energy received from the image scene, and an exposure control system responsive to the photocell and operatively connected to the scanning aperture shutter, wherein the exposure control system is adapted to control the scanning aperture shutter and a flash unit in response to sensed light energy at the photocell to control an amount of fill flash energy in relation to ambient light energy received by the electronic image capture system during image capture.
[0005] The exposure control system may be adapted to illuminate the flash unit once a predetermined amount of ambient light energy is sensed by the photocell, and also to extinguish the flash unit once a predetermined amount of infrared spectrum energy is sensed by the photocell during flash unit illumination. [0006] The photocell may include a visible spectrum photocell and an infrared spectrum photocell, and the exposure control system may adapted to use the visible spectrum photocell to sense ambient light energy received from the image scene prior to illumination by the flash unit and to use the infrared photocell for sensing infrared spectrum energy received from the image scene during illumination by the flash unit. Also, the scanning aperture shutter may include separate apertures for the image capture device, the visible spectrum photocell and the infrared spectrum photocell.
[0007] The exposure control system may be adapted to generate control signals for a detachable flash unit, or the flash unit may be constructed integrally with the camera.
[0008] Another embodiment of the present invention includes an electronic image capture device adapted for capturing an image scene, a scanning aperture shutter located to control light energy received by the image capture device, a flash unit oriented to illuminate the image scene, a photocell unit adapted for sensing visible spectrum energy and infrared spectrum energy received from the image scene, and an exposure control system responsive to the photocell unit and operatively connected to the scanning aperture shutter and the flash unit, wherein the exposure control system is adapted to control an amount of fill flash energy received from the image scene in relation to visible ambient light energy received from the image scene during image capture by illuminating the flash unit once a predetermined amount of ambient visible spectrum energy is sensed by the photocell unit and by extinguishing the flash unit once a predetermined amount of infrared energy is sensed by the photocell unit. [0009] The visible spectrum and infrared spectrum photocells may be separate devices, and the shutter may include separate, proportionately operable, variable apertures for the image capture device and the photocell unit. Also, the flash unit may be a quenchable strobe light. [0010] Yet another embodiment of the present invention provides a method for electronic image capture using a fill flash function, comprising the steps of using a scanning aperture shutter to control light energy received by an electronic image capture device, sensing visible ambient light energy and infrared energy received from an image scene, and controlling the scanning aperture shutter and a flash unit during image capture in response to the sensing to cause a predetermined ratio of fill flash light energy to ambient light energy to be received by the electronic image capture device including illuminating the flash unit once a predetermined amount of ambient light energy is sensed during image capture.
[0011] The step of sensing may use an infrared spectrum photocell for sensing infrared energy received from the image scene during illumination by the flash unit, and further may use a visible light spectrum photocell for sensing ambient light energy received from the image scene before illumination by the flash unit. [0012] The step of controlling may include extinguishing the flash unit once a predetermined amount of infrared spectrum energy is sensed during flash unit illumination. Also, scanning aperture shutter may include separate, proportionately operable, variable apertures for image capture and the step of sensing.
Brief Description of the Drawings [0013] The present invention is illustratively shown and described in reference to the accompanying drawings, in which: [0014] Fig. 1 is a representational side view diagram of an electronic camera constructed in accordance with one embodiment of the present invention as it would be used for image capture;
[0015] Fig. 2 is a representational front view of a blade shutter suitable for use with the camera of Fig. 1;
[0016] Fig. 3 is a representational front view of another blade shutter suitable for use with the camera of Fig. 1; and
[0017] Fig. 4 is a graph of light energy captured by the camera of Fig. 1, verses time.
Detailed Description Of The Drawings [0018] Fig. 1 shows an electronic camera 10 generally including an electronic image capture device 12, a scanning aperture shutter 14, imaging optics 16, a photocell 18 and an exposure control system 20. Attached to camera 10 is a removable flash unit 22. Camera 10 forms an electronic image capture system by using imaging optics 16, such as a lens, to focus an image scene of received light from a field of view 24, on image capture device 12. Scanning aperture shutter 14 is located between imaging optics 16 and image capture device 12 to control the amount of image light received by image capture device 12. [0019] Photocell 18 is directed to sense light energy received from a substantially similar field of view 26, as determined by a separate optical element 28. Light energy received by photocell 18 passes through, and is likewise controlled by shutter 14. In this manner, the light energy sensed by photocell 18 is analogous to the light energy received by image capture device 12. [0020] Exposure control system 20 is coupled to photocell 18 and is adapted to responsively control shutter 14 and image capture device 12 to control the amount of light energy received from flash unit 22 during image capture. [0021] Image capture device 12 may be constructed in any suitable manner, such as in the form of a CCD, which is the best available embodiment at the time of this application. Also, although flash unit 22 is shown as a removable attachment to camera 10, it may also be constructed as an integral part of camera 10, as represented by phantom lines 23.
[0022] As is frequently the case, an image scene 30 may include a near-field object 32 set against a far-field background 34, wherein the natural illumination of far-field background 34 is greater than that of near-field object 32. In this case, a fill flash function is used to provide greater illumination to the near-field object 32 and thereby balance the lighting of the entire photo for better composition. Fill flash is even more frequently used to minimize shadow areas in near field objects. For these purposes, exposure control system 20 is adapted to control the amount of fill flash energy received from flash unit 22 in relation to ambient light energy received during an image capture.
[0023] Fig. 2 is a representational front view of one form of scanning aperture shutter 14, called a blade shutter, which may be used with the camera 10 (Fig. 1). Shutter 14 typically includes a pair of rigid shutter blades 40, 42, which are adapted for relative lateral movement in the direction of arrows 44 by means of an electromechanical actuator 45. Front blade shutter 40 includes apertures 46, 48, and rear blade shutter 42 includes apertures 47, 49, shown in phantom. Aperture pair 46, 47 are intended for image capture and are aligned with image capture device 12 (Fig . 1). Aperture pair 48, 49 are intended for exposing photocell 18 (Fig . 1) to incident image light energy and are therefore intended to be aligned with photocell 18. [0024] The relative lateral movement of shutter blades 40, 42 causes aperture pairs 46, 47 and 48, 49 to progressively overlap and thereby increase the aperture size for incident light energy. The separate aperture pairs 46, 47 and 48, 49 are proportionately sized so that any relative positioning of shutter blades 40, 42 results in generally the same proportion of light energy emitted through aperture pairs 46, 47 and 48, 49. Thus, the amount of light energy sensed by photocell 18 generally represents the same proportion of the light energy emitted through aperture pair 46, 47, regardless of the position of shutter blades 40, 42. In this manner, shutter 14 includes separate, proportionately operable, variable apertures 46, 47 and 48, 49 for image capture device 12 and photocell 18. The art of constructing blade shutters is well developed and many variations from the art may be used with the present invention. Although lateral movement of shutter blades 40, 42 is described, alternative forms of movement, such as rotational, may be used. Likewise, relative shapes and sizes may be varied in accordance with known methods. Although Fig. 2, depicts a single photocell aperture, more than one may be used, and their orientation may vary. [0025] Fig. 3 shows a front view of another pair of blade shutters 50, 52, which include an aperture pair 54, 55 for image capture and separate aperture pairs 56, 57 and 58, 59 to accommodate a visible spectrum photocell 60 and an infrared spectrum photocell 62, respectively. Aperture pair 56, 57 are associated with a monitoring aperture pair 64, which is shown as a single aperture, but is actually a separate aperture in each aperture blade 50, 52. Monitoring aperture pair 64 is designed to be open while aperture pair 54, 55 is closed to allow ambient light monitoring of an image scene prior to image capture. Both aperture pairs 56, 57 and 58, 59 are shaped to provide an analogous representation of the opening of image capture aperture pair 54, 55. The relative orientation of the aperture pairs varies between Figs. 2 and 3 as the orientation of image capture device 12 and photocell 18 may vary in the embodiment of Fig. 1.
[0026] Thus any suitable arrangement of apertures may be used, depending upon the specific photocell arrangement employed. Photocell 18 may take any suitable form such as separate visible spectrum and infrared spectrum photocells, or a single unit adapted to separately sense visible and infrared spectrum energy. [0027] Fig. 4 is a graph, over the exposure time of an image capture, of the amount of light energy admitted through image capture aperture pair 46, 47 (Fig. 2) to thereby form an image on image capture device 12 (Fig. 1). Fig. 4 represents the operation of camera 10 (Fig . 1) in the fill flash mode, wherein the total light energy used for image capture is a mixed proportion of ambient scene illumination and fill flash. As mentioned, photocell 18 senses an analogous amount of received light during image capture. Whereas the instantaneous value of curve 68 represents the light level being received, the area 70, 72 under the graph represents the amount of light energy received over time. In this manner, by monitoring and integrating the output of photocell 18, exposure control system 20 can determine, in real time, the amount of image capture light energy incident upon image capture device 12. [0028] A well known fill flash function typically uses ambient scene illumination to provide approximately 75% of the image capture light energy and the fill flash function to provide the remaining 25 % of image capture energy. This distribution may be varied by image scene. For controlling this distribution, exposure control system 20 monitors and integrates the output of photocell 18 until the integrated area 70 under curve 68 reaches approximately 70% of the necessary amount of image capture light energy. At this point 74, flash unit 22 is illuminated and the amount of incident light energy sensed by photocell 18 increases, very steeply. At some point 76, exposure control system 20 determines that 90 to 95% of the desired image capture light energy has been received and exposure control system 20 quenches flash 22 and closes shutter 14. In a this manner, flash unit 22 may have a variable light output, and exposure control system 20 may be adapted to limit such variable light output in response to light energy sensed by photocell 18. [0029] The rising slope of the left side of curve 68 represents the increasing aperture size of a scanning aperture shutter. It can be appreciated, that in low-light image scenes, the scanning aperture shutter may open to its maximum aperture before approximately 70% of the image capture energy has been sensed or received. In this situation, exposure control system 20 may be programmed to illuminate flash unit 22 to allow the 25% flash contribution to be collected. Shutter 14 may subsequently be left open after flash unit 22 is quenched, so that ambient light is further admitted to reach the preferred distribution. Ambient light received during flash illumination may not be measurable because of visible spectrum flash illumination, but it may be factored into the measurement. [0030] It is known in flash unit technology that the amount of infrared flash energy reflected by objects is more consistent between various objects than the amount of visible spectrum energy. For this reason, the present invention preferably uses an infrared photocell for measuring image scene energy during flash illumination, and those measurements are converted to appropriate visible spectrum values or otherwise factored into the overall light measurement in accordance with methods known in the art. The art of exposure control devices for cameras is well developed, and various physically different devices may be constructed in accordance with known methods to implement the functions of the exposure control system of the present invention.
[0031] The present invention is illustratively described above in reference to the disclosed embodiments. Various modifications and changes may be made to the disclosed embodiments by persons skilled in the art without departing from the scope of the present invention as defined in the appended claims.

Claims

What is claimed is:
1. An electronic camera, comprising: an electronic image capture device adapted for capturing an image scene; a scanning aperture shutter located to control light energy received by said electronic image capture device from said image scene; a photocell adapted for sensing light energy received from said image scene; '. ^ and an exposure control system responsive to said photocell and operatively connected to said scanning aperture shutter, wherein said exposure control system is adapted to control said scanning aperture shutter and a flash unit in response to sensed light energy at said photocell to control an amount of fill flash energy received by said electronic image capture system in relation to ambient light energy received by said electronic image capture system during image capture.
2. The camera of claim 1, wherein said exposure control system is adapted to illuminate said flash unit once a predetermined amount of ambient light energy is sensed by said photocell.
3. The camera of claim 2, wherein said exposure control system is adapted to extinguish said flash unit once a predetermined amount of infrared spectrum energy is sensed by said photocell during flash unit illumination.
4. The camera of claim 1, wherein said photocell includes a visible spectrum photocell and an infrared spectrum photocell, and further wherein, said exposure control system is adapted to use said visible spectrum photocell to sense ambient light energy received from said image scene prior to illumination by said flash unit and to use said infrared photocell for sensing infrared spectrum energy received from said image scene during illumination by said flash unit.
5. The camera of claim 4, wherein said scanning aperture shutter includes separate apertures for said image capture device, said visible spectrum photocell and said infrared spectrum photocell.
6. The camera of claim 1 , wherein said exposure control system is adapted to generate control signals for a detachable flash unit.
7. The camera of claim 1, wherein said flash unit is constructed integrally with said camera.
8. An electronic camera, comprising: an electronic image capture device adapted for capturing an image scene; a scanning aperture shutter located to control light energy received by said image capture device; a flash unit oriented to illuminate said image scene; a photocell unit adapted for sensing visible spectrum energy and infrared spectrum energy received from said image scene; and an exposure control system responsive to said photocell unit and operatively connected to said scanning aperture shutter and said flash unit, wherein said exposure control system is adapted to control an amount of fill flash energy received from said image scene in relation to visible ambient light energy received from said image scene during image capture by illuminating said flash unit once a predetermined amount of ambient visible spectrum energy is sensed by said photocell unit and by extinguishing said flash unit once a predetermined amount of infrared energy is sensed by said photocell unit.
9. The camera of claim 8, wherein said visible spectrum and infrared spectrum photocells are separate devices.
10. The camera of claim 9, wherein said shutter includes separate, proportionately operable, variable apertures for said image capture device and said photocell unit.
11. The camera of claim 1 1, wherein said flash unit is a quenchable strobe light.
12. A method for electronic image capture using a fill flash function, comprising the steps of: using a scanning aperture shutter to control light energy received by an electronic image capture device; sensing visible ambient light energy and infrared energy received from an image scene; and controlling said scanning aperture shutter and a flash unit during image capture in response to said sensing to cause a predetermined ratio of fill flash light energy to ambient light energy to be received by said electronic image capture device including illuminating said flash unit once a predetermined amount of ambient light energy is sensed during image capture.
13. The method of claim 12, wherein said step of sensing uses an infrared spectrum photocell for sensing infrared energy received from said image scene during illumination by said flash unit.
14. The method of claim 13, wherein said step of sensing uses a visible light spectrum photocell for sensing ambient light energy received from said image scene before illumination by said flash unit.
15. The method of claim 12, wherein said scanning aperture shutter includes separate, proportionately operable, variable apertures for image capture and said step of sensing.
16. The method of claim 12, wherein said step of controlling includes extinguishing said flash unit once a predetermined amount of infrared spectrum energy is sensed during flash unit illumination.
PCT/US2004/030002 2003-09-15 2004-09-13 Electronic camera and method with fill flash function WO2005029848A1 (en)

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JP2006526397A JP4418467B2 (en) 2003-09-15 2004-09-13 Electronic camera and method using fill flash function
EP04784006A EP1665777B1 (en) 2003-09-15 2004-09-13 Electronic camera and method with fill flash function

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7978260B2 (en) 2003-09-15 2011-07-12 Senshin Capital, Llc Electronic camera and method with fill flash function

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005086940A2 (en) * 2004-03-11 2005-09-22 Interdigital Technology Corporation Control of device operation within an area
US20060137018A1 (en) * 2004-11-29 2006-06-22 Interdigital Technology Corporation Method and apparatus to provide secured surveillance data to authorized entities
US20060227640A1 (en) * 2004-12-06 2006-10-12 Interdigital Technology Corporation Sensing device with activation and sensing alert functions
US7574220B2 (en) * 2004-12-06 2009-08-11 Interdigital Technology Corporation Method and apparatus for alerting a target that it is subject to sensing and restricting access to sensed content associated with the target
TWI285742B (en) * 2004-12-06 2007-08-21 Interdigital Tech Corp Method and apparatus for detecting portable electronic device functionality
US7663691B2 (en) * 2005-10-11 2010-02-16 Apple Inc. Image capture using display device as light source
US8547457B2 (en) * 2009-06-22 2013-10-01 Empire Technology Development Llc Camera flash mitigation
DE112010004379T5 (en) * 2009-11-13 2012-11-29 Steven Donald Edelson Surveillance and camera system and procedures
TW201227139A (en) * 2010-12-30 2012-07-01 Altek Corp Image capturing apparatus and electronic apparatus
US8836814B2 (en) * 2012-01-18 2014-09-16 Nokia Corporation Method and apparatus for ambient light spectrum detection in digital photography
CN107566747B (en) 2017-09-22 2020-02-14 浙江大华技术股份有限公司 Image brightness enhancement method and device
CN110493506B (en) * 2018-12-12 2021-03-02 杭州海康威视数字技术股份有限公司 Image processing method and system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345828A (en) * 1980-12-24 1982-08-24 Polaroid Corporation Light detecting apparatus for photographic camera
US4941011A (en) * 1989-06-02 1990-07-10 Polaroid Corporation Single integrator system with dual photocells
US6081076A (en) * 1992-08-28 2000-06-27 Asahi Kogaku Kogyo Kabushiki Kaisha Fill-in light emitting apparatus and still video camera
US20020081111A1 (en) * 2000-12-22 2002-06-27 Hirohiko Ina Hybrid camera fill-flash

Family Cites Families (74)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023187A (en) * 1975-10-03 1977-05-10 Polaroid Corporation Exposure control system with fill flash race condition
DE2833064C2 (en) * 1977-07-27 1983-06-23 Ricoh Co., Ltd., Tokyo Device for setting and displaying the exposure time in a camera
US4262301A (en) * 1978-03-30 1981-04-14 Polaroid Corporation Electronic imaging camera
US4196987A (en) * 1978-09-05 1980-04-08 Polaroid Corporation Multiple mode exposure control system with gray code aperture selector
US4192587A (en) * 1978-11-13 1980-03-11 Polaroid Corporation Proportional fill flash
US4285584A (en) * 1979-10-02 1981-08-25 Polaroid Corporation Photometric device
US4325614A (en) * 1980-12-16 1982-04-20 Polaroid Corporation Exposure control system with shutter operation controlled by a microcomputer
US4354748A (en) * 1981-06-22 1982-10-19 Polaroid Corporation Photographic exposure system with computer controlled strobe unit
US4395102A (en) * 1981-12-28 1983-07-26 Polaroid Corporation Bellows for folding camera
US4423936A (en) * 1982-07-26 1984-01-03 Polaroid Corporation Photographic exposure control system and method
US4549801A (en) * 1983-03-21 1985-10-29 W. Haking Enterprises Limited Automatic focussing camera with automatic aperture setting
US4801964A (en) * 1988-01-13 1989-01-31 Eastman Kodak Company Fill flash control system for cameras
US4772910A (en) * 1988-01-19 1988-09-20 Eastman Kodak Company Full/fill flash control system for cameras
JPH0738691B2 (en) * 1988-10-07 1995-04-26 旭光学工業株式会社 Still image remaining amount notification device for still video cameras
US4937676A (en) * 1989-02-10 1990-06-26 Polariod Corporation Electronic camera system with detachable printer
JP2662442B2 (en) * 1989-03-28 1997-10-15 富士写真フイルム株式会社 Video printer
JPH02287527A (en) * 1989-04-28 1990-11-27 Fuji Photo Film Co Ltd Video printer
US5050001A (en) * 1989-07-07 1991-09-17 Fuji Photo Film Co., Ltd. Printing system with liquid crystal shutter matrix panel
US4998128A (en) * 1989-09-29 1991-03-05 Polaroid Corporation Preflash measurement technique
JPH04331935A (en) * 1991-05-07 1992-11-19 Nikon Corp Camera with automatic light control device
JP3340486B2 (en) 1992-12-02 2002-11-05 旭光学工業株式会社 Strobe device
US5611046A (en) 1992-11-18 1997-03-11 Canon Kabushiki Kaisha Method and apparatus for interfacing a peripheral to a local area network
JPH06175188A (en) * 1992-12-08 1994-06-24 Nikon Corp Electronic light control system and electronic flash device
US5815204A (en) * 1993-10-04 1998-09-29 Asahi Kogaku Kogyo Kabushiki Kaisha Strobe apparatus of a still video camera with adjustable color temperature
US5745156A (en) 1994-04-28 1998-04-28 Xerox Corporation Digital printer using two-dimensional, full frame light valve
US5678098A (en) * 1994-06-09 1997-10-14 Fuji Photo Film Co., Ltd. Method and apparatus for controlling exposure of camera
JPH0837613A (en) 1994-07-26 1996-02-06 Kyocera Corp Electronic still camera capable of strobe photographing
US5742905A (en) * 1994-09-19 1998-04-21 Bell Communications Research, Inc. Personal communications internetworking
JP3123891B2 (en) 1995-01-24 2001-01-15 三洋電機株式会社 Electronic still camera
US5673190A (en) * 1995-03-22 1997-09-30 Atrix International, Inc. Multipurpose remote office machine management system
US6167202A (en) * 1995-08-21 2000-12-26 Canon Kabushiki Kaisha Camera system or flash unit
US5742373A (en) * 1995-10-13 1998-04-21 Massachusetts Institute Of Technology Color microdisplays and methods of manufacturing same
JP3420405B2 (en) 1995-09-20 2003-06-23 キヤノン株式会社 Imaging device
US5682562A (en) * 1995-11-13 1997-10-28 Eastman Kodak Company Digitally controlled quench flash circuit
US5794076A (en) * 1995-12-22 1998-08-11 Polaroid Corporation Method and apparatus for controlling exposure
JP3652012B2 (en) * 1996-05-31 2005-05-25 キヤノン株式会社 Projection system for automatic focus detection
US5991290A (en) * 1996-06-03 1999-11-23 Ricoh Company, Ltd. Method and system for forming a digital facsimile message including a subaddress
US5894326A (en) * 1996-08-26 1999-04-13 Eastman Kodak Company Electronic camera having a printer
US5946031A (en) * 1996-10-22 1999-08-31 Polaroid Corporation Electronic still camera with printing capability
US6205294B1 (en) * 1996-10-29 2001-03-20 Polaroid Corporation Imaging apparatus and method
US5754305A (en) * 1996-12-03 1998-05-19 Eastman Kodak Company Method and apparatus for correcting light non-uniformity in an LCD photographic printer
JPH10221736A (en) * 1996-12-04 1998-08-21 Ritsuku:Kk Shutter device and camera device
US5715234A (en) 1996-12-16 1998-02-03 Eastman Kodak Company Electronic camera and associated printer which uses a display image
US5920298A (en) * 1996-12-19 1999-07-06 Colorado Microdisplay, Inc. Display system having common electrode modulation
US6445694B1 (en) * 1997-03-07 2002-09-03 Robert Swartz Internet controlled telephone system
KR100261606B1 (en) 1997-06-30 2000-07-15 이중구 Digital camera possible for telecommunication
JPH1195293A (en) * 1997-09-18 1999-04-09 Konica Corp Image pickup device
US5802413A (en) * 1997-09-18 1998-09-01 Eastman Kodak Company Printer receiving electronic camera
US5822637A (en) * 1997-09-30 1998-10-13 Eastman Kodak Company Electronic camera and attachable printer
US6396565B1 (en) * 1998-01-27 2002-05-28 Noritsu Koki Co., Ltd. Photograph printing device, electronic image input device, film scanner, scratch recognition method, memory medium recording scratch recognition program, and image restoration method
JP3707233B2 (en) * 1998-02-26 2005-10-19 ブラザー工業株式会社 Network adapter and terminal system having the same
US6594032B1 (en) * 1998-10-28 2003-07-15 Matsushita Electric Industrial Co., Ltd. Facsimile apparatus and electronic mail server
US6356356B1 (en) * 1998-12-16 2002-03-12 Alcatel Usa Sourcing, L.P. System and method for transmitting a fax to an E-mail address
US6272292B1 (en) * 1998-12-22 2001-08-07 Nikon Corporation Electronic flash control apparatus
US6791605B1 (en) 1999-05-07 2004-09-14 Eastman Kodak Company Image capture and printing device
US6999114B1 (en) * 1999-09-01 2006-02-14 Polaroid Corporation Electronic camera employing reflective flat panel display for viewing and printing images
WO2001017226A1 (en) 1999-09-01 2001-03-08 Polaroid Corporation Electronic camera employing reflective flat panel display for viewing and printing images
US7124094B1 (en) 1999-10-27 2006-10-17 Konica Corporation Print system, service system, data server, master server, print client system and printer
US6516147B2 (en) * 1999-12-20 2003-02-04 Polaroid Corporation Scene recognition method and system using brightness and ranging mapping
US6473498B1 (en) * 1999-12-21 2002-10-29 Pitney Bowes Inc. Method and system for maximizing use of a communication line
US6633635B2 (en) * 1999-12-30 2003-10-14 At&T Corp. Multiple call waiting in a packetized communication system
US6275104B1 (en) * 2000-03-31 2001-08-14 Hegel As Multistage amplifier with local error correction
JP4416272B2 (en) 2000-05-16 2010-02-17 キヤノン株式会社 IMAGING DEVICE AND CONTROL METHOD OF IMAGING DEVICE
US6912060B1 (en) * 2000-07-05 2005-06-28 Lexmark International, Inc. Photoprinter control of peripheral devices
JP4136321B2 (en) * 2000-09-19 2008-08-20 Ｈｏｙａ株式会社 Flash photography system
JP2002127559A (en) * 2000-10-26 2002-05-08 Komatsu Ltd Public switched telephone network connector for printer and print system
JP4259742B2 (en) * 2000-11-20 2009-04-30 富士フイルム株式会社 Image data processing method and apparatus, and recording medium on which program for executing the method is recorded
GB0028475D0 (en) * 2000-11-22 2001-01-10 Ncr Int Inc Module
US7206806B2 (en) * 2001-05-30 2007-04-17 Pineau Richard A Method and system for remote utilizing a mobile device to share data objects
JP2003021858A (en) * 2001-07-09 2003-01-24 Fuji Photo Film Co Ltd Image pickup device
US20030115250A1 (en) * 2001-12-18 2003-06-19 Bernier Kevin F. Method and system for generating a permanent record of a service at a remote printer
JP2004088243A (en) * 2002-08-23 2004-03-18 Canon Inc Imaging apparatus, and method and apparatus for controlling same
US7889275B2 (en) * 2003-01-28 2011-02-15 Microsoft Corp. System and method for continuous flash
US7978260B2 (en) 2003-09-15 2011-07-12 Senshin Capital, Llc Electronic camera and method with fill flash function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345828A (en) * 1980-12-24 1982-08-24 Polaroid Corporation Light detecting apparatus for photographic camera
US4941011A (en) * 1989-06-02 1990-07-10 Polaroid Corporation Single integrator system with dual photocells
US6081076A (en) * 1992-08-28 2000-06-27 Asahi Kogaku Kogyo Kabushiki Kaisha Fill-in light emitting apparatus and still video camera
US20020081111A1 (en) * 2000-12-22 2002-06-27 Hirohiko Ina Hybrid camera fill-flash

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7978260B2 (en) 2003-09-15 2011-07-12 Senshin Capital, Llc Electronic camera and method with fill flash function
US8553141B2 (en) 2003-09-15 2013-10-08 Senshin Capital, Llc Electronic camera and method with fill flash function

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US20050057682A1 (en) 2005-03-17
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US20110221954A1 (en) 2011-09-15
US8553141B2 (en) 2013-10-08
US7978260B2 (en) 2011-07-12
JP4418467B2 (en) 2010-02-17
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