ELECTRONIC WATERMARK EMBEDDING DEVICE, ELECTRONIC WATERMARK DETECTION DEVICE, METHOD THEREOF, AND PROGRAM

摘要

There is provided an electronic watermark embedding device for embedding electronic watermark information by overlapping a macro block pattern on an image. By diffusing the input electronic watermark information, an embedded sequence of the length corresponding to the number of pixel blocks in the macro block pattern is acquired. According to the term value of the embedding sequence corresponding to the position in the macro block pattern of one pixel block, at least one frequency is selected from a predetermined plurality of frequencies and the waveform pattern corresponding to the selected frequency is set as a pixel in the one pixel block. The macro block pattern in which the waveform pattern is set for each pixel block is amplified with the embed intensity value, and overlapped on the input image in the tile state.