Image processing apparatus

Image analysis – Image compression or coding – Including details of decompression

Reexamination Certificate

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Details

C382S166000, C382S248000, C375S240190, C708S203000

Reexamination Certificate

active

07315652

ABSTRACT:
An image processing apparatus for decoding a compressed image data, the image data being divided to a plurality of tiles, each of which is a basic unit of process in encoding or decoding process, said apparatus comprising: a detector which detects an existence status of ROI within said compressed image data based on a frequency transform coefficient of said tile for every tile; a determiner which determines whether each tile is a ROI tile composed of only ROI, a non-ROI tile composed of only non-ROI, or a ROI boundary tile composed of ROI and non-ROI based on said existence status of ROI detected by said detector; a processor which shifts only frequency transform coefficient of said ROI within each tile to lower bit side for said ROI tile and said non-ROI tile determined by said determiner, and which shifts frequency transform coefficients of both ROI and non-ROI within each tile to lower bit side.

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patent: 2001-218062 (2001-08-01), None
Grosbois et al. (“New Approach to JPEG 2000 Compliant Region of Interest Coding,” SPIE, vol. 4472, 2001, pp. 267-275).
Wang et al. (“Bitplane-by-Bitplane Shift (BbBShift)-A suggestion for JPEG2000 Region of Interest Image Coding,” IEEE Signal Processing Letters, vol. 9, No. 5, May 2002, pp. 160-162).

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