| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic watermark detecting technique for detecting an electronic watermark signals even from image data having variously changed resolutions, without greatly changing apparatus even for image data with changed resolutions. SOLUTION: Among image data with embedded electronic watermarks, those having electronic watermark patterns not deviated are designated and collected to detect electronic watermarks even from image data having variously changed resolutions. For an image having no information of its correct resolution, a resolution may be set to detect an electronic watermark therefrom. COPYRIGHT: (C)2004,JPO |
