| 摘要 |
The present invention relates to a digital watermark insertion system that automatically calculates a digital watermark strength suitable to an input image and inserts a digital watermark into the image. The image categorizing section 103 classifies input images and outputs category indexes. The storage device 101 stores digital watermark characteristic tables describing the correspondences between digital watermark strength, image-quality degradation degree and attack-resistant evaluation value by category index and selects a digital watermark characteristic table to be used according to an input category index. The digital watermark strength calculation section 100 outputs a digital watermark strength to the storage device, calculates an optimum digital watermark strength using an image-quality degradation degree and a resistant evaluation value output from the storage device 103 and constraint information input by an user. The digital watermark insertion section converts embedded data into a digital watermark and inserts the digital watermark in an input image with the strength of an input optimum digital watermark strength, thus outputting a watermarked image.
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