Patent ID: 7095870

Claim:
An electronic watermark embedding apparatus for embedding an electronic watermark in image data, comprising: electronic watermark data generating means for generating data of an electronic watermark to be embedded in the image data; electronic watermark embedding means for embedding the electronic watermark in the image data; image information amount detecting means for detecting an amount of information of the image data in which the electronic watermark is to be embedded and for outputting a signal representing the detected image information amount; and encoding information detecting means for detecting encoding information from the image data in which the electronic watermark has been embedded and which has been encoded, and feeding the detected encoding information back to the electronic watermark embedding means, said electronic watermark embedding means controlling an amount of the electronic watermark data to be embedded in the image data according to the image information amount signal detected by said image information amount detecting means and the encoding information detected by said encoding information detecting means and fed back to the electronic watermark embedding means.