| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve the problem of making a substantially incorrect decision that an evidence photograph is tampered if luminance value correction of compressed image data of a photograph is made within the range of substantially no problem as an evidence photograph, for example.SOLUTION: An electronic signature generation device includes: magnitude relationship comparison means for comparing the relationship of magnitude between blocks in regard to a value corresponding to a lowest frequency component in space frequency components, among values obtained in the process of decompressing the compressed image data, compressed by a predetermined format, and included in the space frequency components of each block of images divided into plurality; and electronic signature generation means for generating an electronic signature on the basis of the comparison result.</p> |
