Research On Zero Watermarking Algorithm For Image Based On Hyper-chaos

Aiming at the poor robustness and low security of the traditional zero watermarking algorithm.A digital image encryption scheme based on hyperchaotic system was proposed.Hyperchaotic system is introduced in the watermark preprocessing stage of the algorithm.Hyperchaotic system improve the security of the whole encryption algorithm from key space and initial value sensitivity.First,the dimensionality reduction of the Chen hyperchaotic system to a one-dimensional chaotic map enhances the sensitivity of the chaotic system to the secret key.Secondly,chaos mapping is used to increase the complexity of the two dimensional hyperchaotic system.Then,the watermarking information is encrypted by the two dimensional hyperchaotic system.In the stage of feature extraction,analyzing the influence of each bit plane on the image,least significant bit of the image carrier is initialized to zeros to extract the feature matrix using of block mean binary quantization method.Finally,Arnold scrambled characteristics matrix and hyper-chaotic encrypted binary watermarking are executed for xor operation to construct a zero watermarking.The experiment in this paper is divided into two aspects,on the one hand,the robustness of the algorithm is evaluated by testing by testing the NC value of the algorithm under various attacks.The simulation attack experiment and comparison with the precious zero watermark algorithm show that the algorithm in this paper can resist noise attack.On the other hand,the algorithm security of watermark information encryption is tested.filter attack,compression attack and shear attack while maintaining better robustness and performs well in tampering detection and location.