| 摘要 |
When a region obtained by predetermined region division processing is a character image, the image is converted at one of predetermined compression ratios (S505). Data in a certain information amount that the region has as pixel data after image conversion is subjected to character recognition, and the degree of similarity (score) to character types registered in advance is calculated (S506). If the calculated score is equal to or smaller than a predetermined threshold value, the information amount is smaller than a minimum information amount necessary for reconstruction of the character image contained in the region. The character image is converted at a compression ratio lower than that in S505 by one step (S507-S509).
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