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Non-linear aggregation mapping compression of image data and method

  • US 5,809,172 A
  • Filed: 04/17/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 04/17/1996
  • Status: Expired due to Term
First Claim
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1. A method of non-linearly aggregating pixel data into aggregation segments and storing the pixel data comprising the steps of:

  • retrieving pixel data from a data source, the pixel data having levels of intensity scale defining information contained within the pixel data, the intensity scale levels extending along a scale of intensity from a minimum intensity end to a maximum intensity end with center intensity scale levels therebetween;

    defining a non-linear series of short and extended aggregation segments along the scale of intensity of the retrieved pixel data, the short segments in the series having the same length formed by S levels of intensity scale, and the extended segments in the series having varying lengths formed by more than S levels of intensity scale;

    determining an aggregation level within each aggregation segment of the segmented scale of intensity, each aggregation level corresponding to an intensity scale level within the aggregation segment;

    aggregating the intensity scale levels within each aggregation segment of the segmented scale of intensity, by setting all of the intensity scale levels therein to the aggregation level for that segment, which introduces partial loss of intensity scale information in the aggregation segments, the amount of intensity scale information lost from each aggregation segment is greater for the extended segments; and

    storing the non-linearly aggregated pixel data in data storage means.

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