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High efficiency technique for coding a digital video signal

  • US 4,729,021 A
  • Filed: 10/30/1986
  • Issued: 03/01/1988
  • Est. Priority Date: 11/05/1985
  • Status: Expired due to Term
First Claim
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1. A high efficiency coding apparatus for coding digital video data in a block format allowing compression of the video data, each block of data including digital video data representing a three dimensional group of picture elements, said coding apparatus comprising;

  • first detecting means for detecting a maximum value of the digital video data of said three dimensional group of picture elements in said block;

    second detecting means for detecting a minimum value of the digital video data of said three dimensional group of picture elements in said block;

    means for generating dynamic range information of the block from said maximum and minimum values;

    means for subtracting said minimum value from each of the digital video data of said three dimensional group of picture elements in said block to generate modified digital video data;

    movement discriminating means for discriminating the existence of movement in each block and generating a discriminating code;

    means for encoding said modified digital data using a smaller number of bits than a corresponding number of bits of said modified digital data, said encoding means being controlled by said discriminating code; and

    transmitting means for transmitting the output of said encoding means and an additional code for each said block formed of said discriminating code and at least two of said maximum value, said minimum value, and a signal based on said dynamic range information.

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