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Lattice vector quantization in image compression and decompression

  • US 6,728,413 B2
  • Filed: 01/19/1999
  • Issued: 04/27/2004
  • Est. Priority Date: 01/19/1998
  • Status: Expired due to Fees
First Claim
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1. A method of coding an index representing a position of a code vector of a code vector dictionary on an isonorm, the index being included in a known group of indices, comprising the steps of:

  • determining a first number and a second number of bits which can be used to code an index, as a function of the number of indices in the group, determining an even delimiter, comparing the index with the delimiter, coding the index decreased by half the delimiter, using the first number of bits, if the index is greater than or equal to the delimiter, and coding the index using the second number of bits, if the index is less than the delimiter.

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