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High efficiency coding apparatus

  • US 4,722,003 A
  • Filed: 11/19/1986
  • Issued: 01/26/1988
  • Est. Priority Date: 11/29/1985
  • Status: Expired due to Term
First Claim
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1. A highly efficient coding apparatus for coding digital video in a block format allowing video data compression for transmission by data transmission means having a predetermined transmission capacity, comprising:

  • first detecting means for detecting a maximum value of the digital video data of plural picture elements in a block;

    second detecting means for detecting a minimum value of said digital video data of plural picture elements in said block;

    means for subtracting said minimum value from the digital video data for each of said picture elements to generate modified digital video data;

    means for generating a distribution table of said dynamic range informatin during a predetermined period;

    means for determining an encoding bit number for each block during said predetermined period from said distribution table and said predetermined transmission capacity of said data transmission means;

    encoding means for encoding said modified digital video data with said encoding bit number andmeans for transmitting an output of said encoding means, a first additional code for each block formed of at least two of said maximum value, minimum value and a signal based on said dynamic range information, and a second additional code for each said predetermined period.

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