05321776 is referenced by 197 patents and cites 6 patents.

A data processing system augments compression of non-zero values of significant coefficients by coding entries of a significance map independently of coding the values of significant non-zero coefficients. A dedicated symbol represents a zerotree structure encompassing a related association of insignificant coefficients within the tree structure. The zerotree symbol represents that a coefficient is a root of a zerotree if, at a threshold T, the coefficient and all of its descendants that have been found to be insignificant at larger thresholds have magnitudes less than threshold T. The zerotree structure is disclosed in the context of a pyramid-type image subband processor together with successive refinement quantization and entropy coding to facilitate data compression.

Title
Data compression system including successive approximation quantizer
Application Number
7/842042
Publication Number
5321776
Application Date
February 26, 1992
Publication Date
June 14, 1994
Inventor
Jerome M Shapiro
Philadelphia
PA, US
Agent
Ronald H Kurdy
Eric P Herrmann
Joseph S Tripoli
Assignee
General Electric Company
NJ, US
IPC
H04N 7/12
G06K 9/68
G06K 9/36
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