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We describes in this paper the robustness of optical watermarking against the defocusing of images, which usually occurs in images taken with digital cameras under nonoptimal conditions. We evaluated measurements of the defocusing of images against the accuracy of detection of optical watermarking. The value of full width at half maximum (FWHM) of the Gaussian function was used to measure the defocusing...
We propose a new technique that uses spatially modulated illumination for embedding time domain sequential data into moving picture data. This is based on the “optical watermarking” technology that can be applied to protect “analog” objects like pictures painted by artists from having photographs taken of them illegally. Another important application of optical watermarking is embedding real time...
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 Discrete Cosine Transform (DCT) or a Walsh-Hadamard Transform (WHT) to produce watermarking images, where 1-bit binary information...
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