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Human vision based pre-processing for MPEG video compression

  • US 6,731,815 B1
  • Filed: 03/03/2000
  • Issued: 05/04/2004
  • Est. Priority Date: 03/03/2000
  • Status: Expired due to Term
First Claim
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1. A method of pre-processing an input video signal to generate a pre-processed video signal with reduced bandwidth for input to a video compressor comprising the steps of:

  • constructing a Gaussian pyramid from the input video signal;

    obtaining a local light level and a global light center from the Gaussian pyramid;

    from the local light level and global light center generating a local gain control signal;

    multiplying a Laplacian image derived from the input video signal by the local gain control signal to produce a modified Laplacian image; and

    subtracting the modified Laplacian image from an equivalent video image derived from the input video signal to produce the pre-processed video signal.

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