A new algorithm for the generation of a type of zero-watermarks which are robust to geometrical attacks

作者：Duanmu Chunjiang^*; Zhang Weidong

来源：International Journal of Digital Content Technology and Its Applications, 2012, 6(15): 388-397.

DOI：10.4156/jdcta.vol6.issue15.44

• Exclusive-OR
• Generation algorithm
• Geometric attacks
• Geometric transform
• Geometrical attacks
• Image features
• Image watermarks
• Logic operations
• Normalized image
• Secret key
• Shearing attack
• Time-stamp
• Watermark embedding
• Watermark images
• XOR operation
• Zero-watermarking

In this paper, a new zero-watermark generation algorithm is proposed, which is based on the timestamp and the features of the whole picture. In this algorithm, it first generates the image feature matrix. Then, the watermark image is extended to the same size of this matrix and is chaotically encrypted to form a chaotic image. Then, the XOR (exclusive or) logic operation is carried out between the image feature matrix and the chaotic image. After that, the result of this XOR operation is saved as the secret key to detect the watermark. At the same time, the algorithm employs the techniques of the watermark embedding with image expansion, and the normalized image watermark detection, so that the image watermark has a strong resilience to rotation and shearing attacks. Simulation results demonstrate that the proposed algorithm is robust to the attacks of common image processing ways and various geometric transforms, and thus this algorithm is feasible, robust, and practical.

• 出版日期2012
• 单位浙江师范大学