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Compression and reconstruction of color aeronautical chart images

  • US 4,965,845 A
  • Filed: 01/20/1988
  • Issued: 10/23/1990
  • Est. Priority Date: 09/05/1985
  • Status: Expired due to Term
First Claim
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1. A method of compressing the effective bandwidth of digitally encoded signals representative of the color composition of picture elements that make up a multiple color image pattern comprising steps of:

  • (a) transforming the color composition of each picture element into its luminance and in-phase and quadrature chrominance components;

    (b) generating a histogram of the luminance and chrominance components obtained in step (a) for the picture elements of said image pattern, said histogram being formed of a plurality of clusters of said luminance and chrominance components;

    (c) for each cluster of which said histogram generated in step (b) is formed, generating a respective first digital code representative thereof;

    (d) for each picture element, generating a second digital code, corresponding to that first digital code which is representative of the cluster to which the luminance and chrominance components of said each picture element is closest; and

    (e) for each of respective pluralities of said second digital codes associated with prescribed pluralities of neighboring picture elements of said multiple color image pattern, generating a third digital code representative of a prescribed combination of colors of which a respective one of said prescribed pluralities of neighboring picture elements within said multiple color image pattern may be formed.

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