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CMOS sensor camera with on-chip image compression

  • US 20020085110A1
  • Filed: 12/17/2001
  • Published: 07/04/2002
  • Est. Priority Date: 05/05/1998
  • Status: Active Grant
First Claim
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1. A method of using a CMOS sensor array to perform a spatial to frequency transform of analog signals from sensor elements of said array, said transform being characterized by a basis function, comprising the steps of:

  • applying a pulsewidth modulated wordline signal to at least one sensor element of said array;

    applying a pulsewidth modulated bitline signal to said at least one sensor element;

    wherein the coincidence of said pulsewidths has a duration corresponding to a product of coefficients of said basis function;

    accumulating the current from said at least one sensor element during said coincidence; and

    repeating said applying and accumulating steps as required by said transform.

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