WO1999044358A3 - Exposure control in electronic cameras by detecting overflow - Google Patents

Exposure control in electronic cameras by detecting overflow Download PDF

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Publication number
WO1999044358A3
WO1999044358A3 PCT/US1999/003766 US9903766W WO9944358A3 WO 1999044358 A3 WO1999044358 A3 WO 1999044358A3 US 9903766 W US9903766 W US 9903766W WO 9944358 A3 WO9944358 A3 WO 9944358A3
Authority
WO
WIPO (PCT)
Prior art keywords
time period
integration time
overflow
circuitry
charge
Prior art date
Application number
PCT/US1999/003766
Other languages
French (fr)
Other versions
WO1999044358A2 (en
Inventor
Richard B Merrill
Carver A Mead
Richard F Lyon
Original Assignee
Foveonics Inc
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 Foveonics Inc filed Critical Foveonics Inc
Publication of WO1999044358A2 publication Critical patent/WO1999044358A2/en
Publication of WO1999044358A3 publication Critical patent/WO1999044358A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/50—Control of the SSIS exposure
    • H04N25/53—Control of the integration time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/50—Control of the SSIS exposure
    • H04N25/57—Control of the dynamic range
    • H04N25/58—Control of the dynamic range involving two or more exposures
    • H04N25/587—Control of the dynamic range involving two or more exposures acquired sequentially, e.g. using the combination of odd and even image fields
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/50—Control of the SSIS exposure
    • H04N25/57—Control of the dynamic range
    • H04N25/59—Control of the dynamic range by controlling the amount of charge storable in the pixel, e.g. modification of the charge conversion ratio of the floating node capacitance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/62—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
    • H04N25/621—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels for the control of blooming
    • H04N25/623—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels for the control of blooming by evacuation via the output or reset lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/63—Noise processing, e.g. detecting, correcting, reducing or removing noise applied to dark current
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
    • H04N25/77—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components
    • H04N25/771—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components comprising storage means other than floating diffusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Solid State Image Pick-Up Elements (AREA)

Abstract

A method for controlling the exposure of an active pixel array electronic still camera includes the steps of: integrating photocurrent in each pixel during an integration time period; collecting overflow charge from all pixels in the array during the integration time period; developing an overflow signal as a function of the overflow charge; and terminating the integration time period when the overflow signal exceeds a preset threshold level selected to represent a desired reference exposure level. Apparatus for performing the method of the present invention includes circuitry for integrating photocurrent in each pixel during an integration time period; circuitry for diverting and detecting overflow charge from all pixels in the array during the integration time period; circuitry for developing an overflow signal as a function of the overflow charge; and circuitry for terminating said integration time period when the overflow signal exceeds a preset threshold level selected to represent a desired reference exposure level.
PCT/US1999/003766 1998-02-26 1999-02-19 Exposure control in electronic cameras by detecting overflow WO1999044358A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/031,333 1998-02-26
US09/031,333 US6452633B1 (en) 1998-02-26 1998-02-26 Exposure control in electronic cameras by detecting overflow from active pixels

Publications (2)

Publication Number Publication Date
WO1999044358A2 WO1999044358A2 (en) 1999-09-02
WO1999044358A3 true WO1999044358A3 (en) 2000-02-03

Family

ID=21858857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/003766 WO1999044358A2 (en) 1998-02-26 1999-02-19 Exposure control in electronic cameras by detecting overflow

Country Status (3)

Country Link
US (3) US6452633B1 (en)
TW (1) TW401690B (en)
WO (1) WO1999044358A2 (en)

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Also Published As

Publication number Publication date
US6833871B1 (en) 2004-12-21
WO1999044358A2 (en) 1999-09-02
US6452633B1 (en) 2002-09-17
US20020024605A1 (en) 2002-02-28
TW401690B (en) 2000-08-11

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