Abstract:We previously proposed a novel technology with which the images of real objects with no copyright protection could contain invisible digital watermarking, using spatially modulated illumination. In this "optical watermarking" technology we used orthogonal transforms such as a DiscreteCosine Transform (DCT) or a Walsh-Hadamard Transform (WHT) to produce watermarking images, where I-bit binary information was embedded into each pixel block. Here, we propose a new robust technique of optical watermarking that var… Show more
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