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Methods and apparatus to count persons in a monitored environment

  • US 8,411,963 B2
  • Filed: 08/07/2009
  • Issued: 04/02/2013
  • Est. Priority Date: 08/08/2008
  • Status: Active Grant
First Claim
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1. An apparatus to count a number of persons in a monitored environment, comprising:

  • an image sensor to collect a plurality of pixels;

    a pseudorandom number generator configured to generate sets of pseudorandom coordinates;

    a reader to read first pixel data generated by first pixels of the image sensor at corresponding first times, the first pixels corresponding to respective sets of the pseudorandom coordinates;

    a comparator to compare the first pixel data with second pixel data generated by the first pixels at respective second times different from the first times to generate first change values; and

    a counter to generate a count of persons based on the first change values.

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