IMAGE PROCESSOR AND IMAGE PROCESSING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an image processor that reduces the required capacity of its memory. SOLUTION: An analyzer 101 detects addresses in which coded data in each stage are stored. Input means i1-i5 transfer coded data in each stage of a block BK 1 to a selector 103 depending on the address information from the analyzer 101. The selector 103 gives the coded data of each stage in the block BK 1 to a Huffman decoder 102. A selector 109 transfers DCT coefficient data in each stage of the block BK 1 from the Huffman decoder 102 to storage areas d1-d5 of a coefficient memory M4. Thus, DCT coefficient data C1-C64 of the block BK 1 are obtained. Inverse quantization, inverse DCT, color space transformation and color number reduction processing are applied to the obtained DCT coefficient data C1-C64 and the resulting data are transferred to an expansion image memory M2. Similarly, expansion image data of blocks BK 2-BK 16 are transferred to the expansion image memory M2.