(28) 手書き署名をフーリエ空間に埋め込む電子透かし法
北海学園大学工学部研究報告, 第33号, pp.97-111, 2006-2
We present a watermarking technique by which the watermark image consisting of handwritten signature is hidden in the Fourier space. First, we investigate theoretically the conditions under which the original image is scarcely damaged and at the same time the watermark image can be recovered. According to the theoretical results, several experiments are conducted and the effects of the size of the watermark and its embedding position in the Fourier space are made clear. Furthermore, the robustness of the presented watermarking method is also revealed with respect to removing the low-bit-planes and cutting out of images which contain the watermark.
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