Method and apparatus for visual lossless image syntactic encoding

  • US 6,473,532 B1
  • Filed: 03/14/2000
  • Issued: 10/29/2002
  • Est. Priority Date: 01/23/2000
  • Status: Expired due to Term
First Claim
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1. A visual lossless encoder for processing a video frame prior to compression by a video encoder, the encoder comprising:

  • threshold means for identifying a plurality of visual perception threshold levels to be associated with the pixels of said video frame, wherein said threshold levels define contrast levels above which a human eye can distinguish a pixel from among its neighboring pixels of said frame;

    filter means for dividing said video frame into portions having different detail dimensions;

    means, utilizing said threshold levels and said detail dimensions, for associating said pixels of said video frame into subclasses, wherein each subclass includes pixels related to the same detail and which generally cannot be distinguished from each other; and

    means for altering the intensity of each pixel of said video frame according to its subclass.

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