Image analysis – Image compression or coding – Pyramid – hierarchy – or tree structure
Reexamination Certificate
2004-07-09
2008-11-11
Dang, Duy M (Department: 2624)
Image analysis
Image compression or coding
Pyramid, hierarchy, or tree structure
C382S232000
Reexamination Certificate
active
07450771
ABSTRACT:
A method of optimizing a compression of a still image in JPEG 2000 format, which includes the steps of: (a) dividing an image into a predetermined numbers of tiles each having a predetermined numbers of tile pixels; (b) decomposing each of the tiles into a predetermined number of subbands by Discrete Wavelet Transform (DWT); (c) partitioning each of the subbands into a predetermined number of code-blocks which are arranged into a plurality of bit-planes respectively; (d) minimizing a total rate with a given predetermined total distortion of image so as to pre-determine an optimal truncation point for each of the code-blocks; (e) truncating a predetermined part of the DWT coefficients for each of the code-blocks so as to reduce computational resource; and (f) encoding each of the code-blocks by embedded block-coding to form an embedded code-stream having a plurality of code passes.
REFERENCES:
patent: 6760482 (2004-07-01), Taubman
patent: 7023922 (2006-04-01), Xu et al.
patent: 2003/0035478 (2003-02-01), Taubman
patent: 2006/0239345 (2006-10-01), Taubman et al.
Chang Yu-Wei
Chen Liang-Gee
Fang Hung-Chi
Dang Duy M
National Taiwan University
Rabin & Berdo P.C.
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