Image analysis – Image compression or coding – Pyramid – hierarchy – or tree structure
Patent
1997-03-31
1999-07-13
Couso, Jose L.
Image analysis
Image compression or coding
Pyramid, hierarchy, or tree structure
382239, G06K 900
Patent
active
059237856
ABSTRACT:
A method codes a hierarchical subband system of coefficients of a wavelet transform that is representative of an image. One step of this method includes receiving the coefficients of a wavelet transform. A second step includes selecting a first plurality of thresholds ranges. A third step includes comparing the coefficients of a tree structure of coefficients against the plurality of threshold ranges during a first single traversal of the tree structure. A fourth step includes coding the coefficients of the tree structure with symbols based on whether the coefficients are or are not within at least one of the plurality of threshold ranges. A method may include defining a set of symbols for coding a hierarchical subband system of coefficients of a wavelet transform that is representative of an image. This method includes defining a first set of significance symbols that are representative of the significance of a coefficient with respect to a selected and defining a first set of tree structure traversal symbols that indicate the path in which the tree structure should be traversed and the tree structure traversal symbols being operative for combining with selected ones of the significance symbols.
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"An Embedded Hierarchical Image Coder Using Zerotress of Wavelet Coefficients"; Jerome M. Shapiro; IEEE; Jan. 1993 pp. 214-223, (No Place of Publication).
"A New Fast and Efficient Image Codec Based on Set Partitioning in Hierarchical Trees"; Amir Said and William A. Pearlman; IEEE Transactions on Circuits and Systems for Video Technology; May 1993-pp. 1-16.
"Embedded Image Coding Using Zerotrees of Wavelet Coefficients"; James M. Shapiro; IEEE Transactions on Signal Processing, vol. 41, No. 12, Dec. 1993-pp. 3445-3462.
Couso Jose L.
Interated Systems, Inc.
Tadayon Bijan
LandOfFree
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