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Block-By-Block SVD Image Watermarking with Variable Block Sizes


Affiliations
1 Department of Electronics and Electrical Communications, Menoufia University, Menouf-32952, Egypt
2 Department of Electronics and Electrical Communications, Menoufia University, Menouf 32952, Egypt
3 Department of Electronics and Electrical Communications, Menoufia University, Menouf 32952, Egypt
     

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This paper presents a block-by-block SVD watermarking algorithm with variable block sizes. The paper makes a comparison between the traditional method of Liu and the proposed method. In the proposed approach, the original image is divided into blocks, and then the watermark is embedded in the singular values (SVs) of each block, separately. This segmentation and watermarking on a block-by-block basis makes the watermark more robust to the attacks such as noise, compression, cropping and other attacks as the results reveal. Watermark detection is implemented by extracting the watermark from the SVs of the watermarked blocks.  Extracting the watermark from one block at least is enough to ensure the existence of the watermark. Experimental results show that the proposed method with different block sizes is superior to the traditional method of Liu for embedding unencrypted watermarks.


Keywords

Image Processing, Cryptography, Watermarking, Singular Value Decomposition.
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  • Block-By-Block SVD Image Watermarking with Variable Block Sizes

Abstract Views: 193  |  PDF Views: 2

Authors

Amany F. Eldaoshy
Department of Electronics and Electrical Communications, Menoufia University, Menouf-32952, Egypt
Moawad I. Dessouky
Department of Electronics and Electrical Communications, Menoufia University, Menouf 32952, Egypt
Al-Dalil Sami
Department of Electronics and Electrical Communications, Menoufia University, Menouf 32952, Egypt
Fathi E. Abd El-Samie
Department of Electronics and Electrical Communications, Menoufia University, Menouf 32952, Egypt

Abstract


This paper presents a block-by-block SVD watermarking algorithm with variable block sizes. The paper makes a comparison between the traditional method of Liu and the proposed method. In the proposed approach, the original image is divided into blocks, and then the watermark is embedded in the singular values (SVs) of each block, separately. This segmentation and watermarking on a block-by-block basis makes the watermark more robust to the attacks such as noise, compression, cropping and other attacks as the results reveal. Watermark detection is implemented by extracting the watermark from the SVs of the watermarked blocks.  Extracting the watermark from one block at least is enough to ensure the existence of the watermark. Experimental results show that the proposed method with different block sizes is superior to the traditional method of Liu for embedding unencrypted watermarks.


Keywords


Image Processing, Cryptography, Watermarking, Singular Value Decomposition.