enhanced images watermarking based on amplitude modulation image and vision computing, 24 (2006),...
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Enhanced images watermarking based on amplitude modulation
Image and Vision Computing, 24 (2006), 111–119Authors :T. Amornraksa, K. JanthawongwilaiPresenter: 李振祥
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Outline
Introduction Amplitude modulation based
watermarking The proposed method Experimental results Conclusions
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Introduction
L(I,j)=0.299R(I,j)+0.587G(I,j)+0.114B(I,j)
By balancing watermark bits around the embedding pixel.(preparing process)
By properly tuning the strength of embedding watermark. (embedding process)
By modifying the methods of pixel prediction. (retrivieval process)
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Amplitude modulation based watermarking(1/3)
Scaling factor
Luminance
Watermark
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Amplitude modulation based watermarking(2/3)
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rewrite
Amplitude modulation based watermarking(3/3)
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The proposed method
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The proposed method-1 XOR (for
watermark)
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The proposed method-1
0
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The proposed method-2 Gaussian mask
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The proposed method-3
Pixel value replacing
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6 7 8
7 8 9
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6 7 8
7 8 9
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results
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Experimental results (Attack)
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Experimental results (Attack)
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Experimental results (Attack)
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Experimental results (Attack)
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Experimental results (Attack)
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Experimental results (Attack)
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Conclusions
To improve accuracy and robustness of the watermark can use:
Employing an error control coding Multiple embedding techniques