| 摘要 |
When data of one block is subjected to Huffman decoding (S 100 to S 120 ), inverse quantization processing is executed on the decoded data (S 130 ), and when a present block is a starting point block, starting point restoring information (file pointer, decoding intermediate information and DC component) for restoring the image file with the block as a starting point is stored in a predetermined area of a data buffer (S 140 , S 150 ). Then, inverse DCT calculation processing is carried out, color conversion processing is executed (S 160 , S 170 ) and the histogram of RGB values is accumulated and stored in a predetermined area of the data buffer (S 180 ).
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