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Data compression apparatus for video signal and method of data compression for video signal

  • US 5,283,656 A
  • Filed: 10/07/1991
  • Issued: 02/01/1994
  • Est. Priority Date: 10/08/1990
  • Status: Expired due to Term
First Claim
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1. A data compression apparatus for video data having:

  • dividing means for dividing said video data into unit blocks, converting means for orthogonally converting said video data at each of unit blocks, quantizing means for quantizing said orthogonally converted video data, and coding means for run-length-coding said quantized video data, comprising;

    (a) first detection means for detecting sums of absolute values of said video data in horizontal and vertical directions within given filter passbands, respectively;

    (b) second detection means for detecting a difference between said sums of absolute values; and

    (c) control means for controlling the amount of coded data produced by said run-length-coding in accordance with a difference between said sums of absolute values.

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