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Method and apparatus for processing images of facial expressions

  • US 5,689,575 A
  • Filed: 11/21/1994
  • Issued: 11/18/1997
  • Est. Priority Date: 11/22/1993
  • Status: Expired due to Term
First Claim
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1. An image processing apparatus comprising:

  • means for receiving a color facial image data stream in digital format;

    a plurality of image data processing circuits interconnected for real time processing the image data in a pipelining manner to provide a real time output, the circuits comprising;

    means for monitoring color values in the image data to identify image data pixels representing facial parts, and monitoring means comprising means for carrying out three-dimensional color histogram matching to monitor frequency of occurrence of pixel values in the image data and a backprojection means for comparing a generated histogram with a template histogram generated off-line, andmeans for determining states of the facial parts by monitoring positional coordinates of the identified pixels, said means for determining further comprising a counter for determining the area of the facial part or parts; and

    an output device outputting the determined facial part state data in real time.

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