Study Of Robust Watermarking Algorithm Based On The Ridgelet-domain

Wavelet transform is not the best way for extracting watermarking image contour feature.Ridgelet transform has better accuracy and sparse approximation performance that can better deal with the Linear Singularity of the image.A kind of robust zero-watermarking algorithm based on ridgelet transform domain is proposed,which combined with the two-dimensional chaotic system,SVD and bit-plane to construct the watermarking.Firstly,the algorithm takes advantage of the wavelet transform to extract the low-frequency domain in carrier image.Secondly,according to the blocking strategy decompose the low-frequency domain.When all the blocks are transformed by FRIT,the characteristic matrix can be constructed by SVD.Moreover,apply the two-dimensional chaotic system to encrypt the characteristic matrix.Finally,extract the most significant bit-plane in the feature matrix and combined with the encrypted meaningful watermarking to generate registration zero-watermarking information.After that robust performance tests and false alarm rate performance tests are performed.In Ridgelet domain,the algorithm can obtain image features with better approximation accuracy and better sparse performance,so as to construct watermarking information.The algorithm has a good ability to resist false alarm.In robust performance,compared with other similar algorithms,the algorithm for the general performance of resist cropping attack and noise attack are improved.And compared with wavelet domain watermarking algorithms,it has better texture features and line shape of singularity.