IMAGE PROCESSING APPARATUS, COMPRESSION METHOD, AND EXTENSION METHOD

摘要

PROBLEM TO BE SOLVED: To perform compression or extension processing corresponding to an attribute of an image.

SOLUTION: An image processing apparatus includes an image compression conversion unit to quantize an image having attribute data for each pixel. The image compression conversion unit quantizes a region having the attribute data of a photographic image by a BTC system (step S5;Y, S6); quantizes a region having the attribute data other than the photographic image by the BTC system when the region is of a halftone region; creates a density pattern of the region when the region is of a high resolution region; and quantizes the region corresponding to the produced density pattern (step S5;N, S7).

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