发明名称 |
Exposure control in electronic cameras by detecting overflow from active pixels |
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.
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申请公布号 |
US6452633(B1) |
申请公布日期 |
2002.09.17 |
申请号 |
US19980031333 |
申请日期 |
1998.02.26 |
申请人 |
FOVEON, INC. |
发明人 |
MERRILL RICHARD B.;MEAD CARVER A.;LYON RICHARD F. |
分类号 |
H04N3/15;(IPC1-7):H01L27/148;H04N3/14 |
主分类号 |
H04N3/15 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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