Wide dynamic range image sensor and method of use
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United States of America Patent
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Aug 12, 2008
Grant Date -
Nov 15, 2007
app pub date -
Nov 3, 2006
filing date -
May 12, 2006
priority date (Note) -
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Abstract
An exemplary image sensor comprises a photodetector proximate to a pixel site, and a light meter proximate to the pixel site configured to approximate an initial charge acquired by the photodetector at the end of a first integration period of a frame exposure period. A reset circuit resets the photodetector if the approximated initial charge acquired by the photodetector exceeds a threshold. A readout circuit detects a final charge acquired by the photodetector at the end of a second integration period of the frame exposure period. If the photodetector was reset, the readout circuit adjusts the final exposure to account for exposure prior to the photodetector having been reset.
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