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Quantization method for image data compression employing context modeling algorithm

  • US 5,640,159 A
  • Filed: 05/06/1996
  • Issued: 06/17/1997
  • Est. Priority Date: 01/03/1994
  • Status: Expired due to Fees
First Claim
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1. A method for performing data compression on data elements of a body of input data, each data element having a respective context, the method comprising the steps of:

  • quantizing each of the data elements separately, based on the context of that data element, thereby performing a lossy data compression of the data elements;

    dividing the quantized data elements, by value, into a predetermined number of categories;

    for each of the categories, selecting a respective value as a single quantized value to represent each of the data elements of the category;

    determining whether the body of input data to be compressed has a dependency; and

    ,responsive to a determination by the step of determining that the body of input data has a dependency, constructing a model to account for the dependency.

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