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Method and apparatus for encoding and decoding video

  • US 4,517,597 A
  • Filed: 09/14/1982
  • Issued: 05/14/1985
  • Est. Priority Date: 09/14/1982
  • Status: Expired due to Fees
First Claim
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1. Apparatus for encoding and decoding a video signal, comprising:

  • (A) an encoder, including;

    means for storing an input video frame as an array of pixel values;

    means for interrogating the stored array and for generating (i) a sum signal representative of the sum of the pixel values in a group of pixels, and (ii) a difference signal representative of the difference between the total of the pixel values of some of the pixels in the group and the total of the pixel values of other pixels in the group;

    the sum signal and the difference signal being generated for a multiplicity of groups which cover the video frame;

    said sum signal being generated at a relatively high information rate, and said difference signal being generated at a relatively low information rate;

    (B) a decoder, including means for combining the sum and difference signals to obtain an output pixel value for each pixel of an output video frame.

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