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Title |
Ridgelet-Based Robust and Perceptual Watermarking for Images |
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Author |
Xiao Liang, Wei Zhihui, Wu Huizhong |
| Citation |
Vol. 6 No. 2 pp. 194~201 |
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Abstract |
A watermarking algorithm operating in the ridgelet domain is proposed. Since the most significant coefficients of the ridgelet transform(RT) can represent the most energetic direction of an image with straight edge, the image is first partitioned into small blocks and RT is applied for each block. According to the structure of ridgelet decomposition which perfectly match the multi-channel structure of the human visual system (HVS), a Just Noticeable Distortion(JND) is accomplished by pixel by pixel taking into account the contrast sensitivity, frequency sensitivity and masking effect of all ridgelet subbands. The watermark consists of a pseudorandom sequence which is adaptively added to the most significant ridgelet coefficients of each image block, the strength of embedding watermark is adjust by the JND. As usual, the watermarks are blindly detected using a correlation detector. The detection threshold is chosen by the statistical properties of the correlation detector. Experimental results show that the robustness and transparency can be well proved by the proposed watermarking algorithm. |
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Keywords |
Information security, digital watermark, ridgelet transform, perceptual embedding, blindly detection |
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