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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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