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10 September 2005 Binary phase-only filter based image self-authentication
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The binary phase-only filter (BPOF) based watermarking for image authentication was proposed earlier [5] and it shows good performance. In this paper, three image self-authentication algorithms based on BPOF with different watermark embedding methods from Reference 5 are proposed. The BPOF of an image is used as the watermark to embed into its Fourier spectrum by adding to the magnitude or quantizing the magnitude of the Fourier spectrum. For image authentication, either the correlation between the BPOF of the test image with its Fourier magnitude spectrum is computed, or the correlation between the phase information of the test image with the candidate watermark extracted from it is calculated, according to the different embedding methods used in the embedding stage. By using these embedding methods, we expand the potential watermark embedding strength, which is very important for security and robustness of digital watermarking. The performance of these three algorithms is evaluated via computer simulation.
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Jun Sang and Mohammad S. Alam "Binary phase-only filter based image self-authentication", Proc. SPIE 5908, Optical Information Systems III, 59081G (10 September 2005);


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