| 摘要 |
PROBLEM TO BE SOLVED: To embed information in a document image so as to be able to more accurately extract the embedded information. SOLUTION: An information embedding apparatus 100 which embeds information by changing the character spacing in a document image includes a discrimination unit 101 which discriminates a text area in the document image, a circumscribed rectangle extraction unit 102 which extracts the circumscribed rectangle of each character in the text area discriminated by the discrimination unit 101, a determination unit 103 which determines, based on the position and size of each extracted circumscribed rectangle, whether a portion having a character spacing smaller than a threshold exists, a reduction unit 104 which, for a character determined to have a character spacing smaller than the threshold by the determination unit 103, reduces the size of the character in at least the character arrangement direction so that the character spacing is not smaller than the threshold, and a character position changing unit 105 which changes, in accordance with information to be embedded, the position of a character wherein a character spacing is equal to or larger than the threshold at the determination unit 103, and that of a character after reduced by the reduction unit 104. COPYRIGHT: (C)2009,JPO&INPIT
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