WO1996019092A3 - System and method for generating a contrast overlay as a focus assist for an imaging device - Google Patents

System and method for generating a contrast overlay as a focus assist for an imaging device Download PDF

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Publication number
WO1996019092A3
WO1996019092A3 PCT/US1995/016029 US9516029W WO9619092A3 WO 1996019092 A3 WO1996019092 A3 WO 1996019092A3 US 9516029 W US9516029 W US 9516029W WO 9619092 A3 WO9619092 A3 WO 9619092A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
contrast
image
reduced
channel signals
Prior art date
Application number
PCT/US1995/016029
Other languages
French (fr)
Other versions
WO1996019092A2 (en
Inventor
Eric C Anderson
Original Assignee
Apple Computer
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 Apple Computer filed Critical Apple Computer
Priority to AU43774/96A priority Critical patent/AU4377496A/en
Publication of WO1996019092A2 publication Critical patent/WO1996019092A2/en
Publication of WO1996019092A3 publication Critical patent/WO1996019092A3/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00Diagnosis, testing or measuring for television systems or their details
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • H04N23/63Control of cameras or camera modules by using electronic viewfinders
    • H04N23/633Control of cameras or camera modules by using electronic viewfinders for displaying additional information relating to control or operation of the camera
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • H04N23/67Focus control based on electronic image sensor signals
    • H04N23/673Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/68Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Abstract

A system for generating and displaying a contrast false color overlay as a focus assist includes a signal divider, an automatic gain control unit, an adder, a signal reducer and a signal combiner. The signal divider receives a signal representing an image and divides the signal into a red channel signal, a green channel signal and a blue channel signal. The red, green and blue channel signals are input to the signal reducer and respectively reduced by a percentage value. The reduced Green and Blue channel signals are input to the signal combiner and combined with the output of the adder. A luminance signal is also input or generated from the channel signals and is fed to the automatic gain control unit which produces a contrast signal whose brightness is proportional to the contrast in the image. The contrast signal is input to the adder along with a reduced version of the red channel signal where the two signals are added together, and the output of the adder is provided to the combiner. The output of the combiner is then provided to the output device for display of the image. The present invention also comprises a method for adjusting the display to provide a false color contrast overlay as a focus assist, the method comprising the steps of: receiving a signal representing an image; separating the signal into channels; receiving or generating a luminance signal; producing a contrast signal with an amplitude that varies with the contrast in the image from the luminance signal; reducing the contrast signal; reducing the channel signals; combining the reduced contrast signal with one of the reduced channel signals; and generating an image on the output device using the combined signal and the reduced channel signals.
PCT/US1995/016029 1994-12-13 1995-12-12 System and method for generating a contrast overlay as a focus assist for an imaging device WO1996019092A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43774/96A AU4377496A (en) 1994-12-13 1995-12-12 System and method for generating a contrast overlay as a focus assist for an imaging device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/355,031 1994-12-13
US08/355,031 US5496106A (en) 1994-12-13 1994-12-13 System and method for generating a contrast overlay as a focus assist for an imaging device

Publications (2)

Publication Number Publication Date
WO1996019092A2 WO1996019092A2 (en) 1996-06-20
WO1996019092A3 true WO1996019092A3 (en) 1996-08-22

Family

ID=23395956

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/016029 WO1996019092A2 (en) 1994-12-13 1995-12-12 System and method for generating a contrast overlay as a focus assist for an imaging device

Country Status (3)

Country Link
US (1) US5496106A (en)
AU (1) AU4377496A (en)
WO (1) WO1996019092A2 (en)

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Also Published As

Publication number Publication date
WO1996019092A2 (en) 1996-06-20
AU4377496A (en) 1996-07-03
US5496106A (en) 1996-03-05

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