Wide dynamic range optical sensor

  • US 6,008,486 A
  • Filed: 12/31/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 12/31/1997
  • Status: Expired due to Term
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First Claim
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1. A method for increasing dynamic range for an optical sensor, the optical sensor having frame period and the optical sensor including a plurality of pixel cells, the method comprising:

  • storing a first signal within each pixel cell, the first signal proportional to light integrated by the pixel cell over the previous frame period;

    generating a second signal within each pixel cell, the second signal proportional to light integrated by the pixel cell over the current frame period;

    generating an output signal as the sum of signals from each pixel cell; and

    storing within each pixel cell the second signal, whereby in the next application of the method the stored second signal is operative as the first signal and a new second signal is generated.

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