A DCT-domain system for robust image watermarking
Signal Processing
A Novel Image Scrambling and Watermarking Scheme Based on Cellular Automata
ISECS '08 Proceedings of the 2008 International Symposium on Electronic Commerce and Security
A Robust Chaos-Based DCT-Domain Watermarking Algorithm
CSSE '08 Proceedings of the 2008 International Conference on Computer Science and Software Engineering - Volume 03
Secure spread spectrum watermarking for multimedia
IEEE Transactions on Image Processing
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The watermark is more likely to prevent itself from JPEG-compression attack when it is embedded into the DC values of 8×8 DCT blocks. However, embedding the watermark with the same intensity into the DC values of DCT blocks may distort the watermarked image to a large extent. To solve this problem, a novel robust image-watermark algorithm is proposed with the characteristics of selective embedding intensity based on the non-uniform partition. Firstly, following the rectangular partition algorithm, the image has automatically been partitioned into different rectangles which reflect the grey-distribution characteristics in different dimensions. Secondly, the suitable embedded intensities have been chosen, according the number of rectangles within each 8×8 block. Meanwhile, in order to increase the anti-cropping function and the security of the algorithm, MUST* Encryption Algorithm is applied to encrypt the pixellocations of the watermark before the watermark is embedded. The results of the experiments have showed that this algorithm is robust against noising attack, cropping attack, especially the JPEG-compression attack and no obvious distortion appeared in the watermarked image.