ELECTRONIC WATERMARK EMBEDDING APPARATUS, ELECTRONIC WATERMARK DETECTION DEVICE, METHODS THEREOF, AND PROGRAMS THEREOF

摘要

PROBLEM TO BE SOLVED: To provide an electronic watermark embedding apparatus can embedding an electronic watermark in rephotographed video without any deterioration in image quality.

SOLUTION: An image division section 11 divides an input electronic image 100a into a plurality of image areas. An embedding inhibition pixel extraction section 12 extracts, as embedding-inhibited pixels, pixels having characteristics such that variation in pixel value is easy to view in a divided electronic image 100b. A watermark pattern generation section 13 generates an electronic watermark pattern 13a changing in the time direction based upon embedded bits, time information, and a random-number initial value. An embedding processing section 14 adds the watermark pattern 13a to pixels other than the embedding-inhibited pixels for each area of the divided electronic image 100b to embed the electronic watermark, and outputs the embedded electronic image 100c.

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