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Method and arrangement for redundancy-reducing picture coding

  • US 4,190,861 A
  • Filed: 09/01/1977
  • Issued: 02/26/1980
  • Est. Priority Date: 09/07/1976
  • Status: Expired due to Term
First Claim
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1. A method of redundancy-reducing coding of the values of picture elements of pictures which are scanned line-by-line and which are distributed in a matrix as lines and picture elements, a difference value being formed for substantially each picture element, said difference value being the difference between the actual value of the picture element and a predictive value obtained from the values of other picture elements, comprising the steps of:

  • dividing the picture matrix into adjacent, equally large, square sub-pictures;

    intermediate storing the values of the picture elements of the picture lines which are covered by a series of sub-pictures;

    obtaining the predictive value for a picture element from the values of the other picture elements of the associated sub-picture; and

    quantizing the resulting first difference values.

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