| 摘要 |
PROBLEM TO BE SOLVED: To apply imbedding processing to image data or the like by adaptively optimizing imbedding data, denoting attached information such as copyright information depending on contents of the data which is an imbedding object. SOLUTION: An image division section 200 divides image data Vi into image blocks Iij and corresponds them to selection basic patterns Phij. Orthogonal conversion sections 24, 202 generate DFT coefficients I'ij, P'hij, and power component calculation section 208, 264 generate power components I"ij, P"ij. A basic pattern adjustment section 26 adjusts the coefficients P'hij to generate P'hij1-P'hijn. An imbedding pattern generating section 28 calculates a change before and after the P'hij1-P'hijn are imbedded to the I"ij, selects P'''hij1-P'''hij1 which give a change of a thresholdεor bower from the P'hij1-P'hijn and selects one imbedding pattern P'ij which is detected most easily. A pattern imbedding section 204 adds the P'ij to the I'ij and imbeds the sum. |
