发明授权
US06833871B1 Exposure control in electronic cameras by detecting overflow from active pixels
有权
通过检测有源像素的溢出来在电子照相机中进行曝光控制
- 专利标题： Exposure control in electronic cameras by detecting overflow from active pixels
- 专利标题（中）： 通过检测有源像素的溢出来在电子照相机中进行曝光控制
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申请号： US09872070申请日： 2001-07-16
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公开(公告)号： US06833871B1公开(公告)日： 2004-12-21
- 发明人: Richard B. Merrill , Carver A. Mead , Richard F. Lyon
- 申请人： Richard B. Merrill , Carver A. Mead , Richard F. Lyon
- 主分类号： H04N314
- IPC分类号： H04N314
摘要：
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 a 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.