| 摘要 |
Provided is a technology of embedding watermark data into an arbitrarily-shaped region by applying a wavelet transform. Prepared are: image data into which the watermark data is to be embedded; a shape map that defines the arbitrarily-shaped region into which the watermark data is to be embedded within the image data; and the watermark data. An SA-DWT processing unit uses the shape map to recognize a given region included in the arbitrarily-shaped region within the image data, and subjects image data in the given region to the wavelet transform. The wavelet transform causes the image data in the arbitrarily-shaped region to be divided into frequency bands, and a watermark data embedding unit embeds the watermark data into a frequency space of the image data generated by the dividing. An SA-IDWT processing unit subjects the resultant to an inverse wavelet transform, and watermark-embedded image data is generated.
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