Phase Watermarking Algorithm using Hybrid Multi-Polarity Hadamard Transform |
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| Authors: | Bogdan J. Falkowski |
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| Affiliation: | (1) School of Electrical & Electronic Engineering, Nanyang Technological University, Block S1, 50 Nanyang Avenue,, Singapore, 639798, Singapore |
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| Abstract: | In this paper, a robust phase watermarking algorithm for still images is presented where the watermark information is conveyed in the phase spectrum in the transform domain. Phase watermarking algorithm that uses multi-polarity Walsh-Hadamard and Complex Hadamard transform is developed. The robustness of presented algorithm is investigated by its uniqueness, JPEG encoding, image resizing, dithering noise distortions, sharpening, cropping and successive watermarking. |
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| Keywords: | Unified complex Hadamard transform Multi-polarity complex Hadamard transform Multi-polarity Walsh-Hadamard transform Phase watermarking Spectral techniques |
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