| 摘要 |
PROBLEM TO BE SOLVED: To provided a watermark information extracting device and its control method which eliminate the need to use an original image to extract watermark information embedded in an image by electronic watermarking and have nearly the same extraction precision with a conventional method of extracting the information by using the original image. SOLUTION: A verification image 100 in which the watermark information is embedded by electronic watermarking is inputted from an input part 101. A recognition processing part 102 acquires character information of a specified character included in the verification image 100 by using a recognition dictionary 103. According to the acquired character information, an original image reconstituting part 104 reconstitutes an original image 105 before the watermark information is embedded. According to difference components between the specified character of the reconstituted original image 105 and the specified character of the verification image 100, a watermark extraction part 106 extracts the watermark information 107. COPYRIGHT: (C)2003,JPO
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