A Robust Watermarking Algorithm Based on RadonTransform and Multiple-Level Discrete Cosine Transform

The contourlet transform and 'Multiple-level'concept is introduced from Discrete Wavelet Transform to Discrete Cosine Transform,and traditional watermarking methods in DCT domain are insufficient to resist rotation geometric attacks that is analyzed and improved.A digital watermarking algorithm is proposed based on radon transform and multiple-level Discrete Cosine Transform.In the proposed algorithm,firstly the watermark information is embedded in the selected coefficients of multiple-level Discrete Cosine Transform.Using Radon transform detection algorithm to correct the text image,then watermark information is extracted.Experimental results show that the proposed algorithm has better robustness compared with common digital watermarking algorithms based on DCT,and its real-time property is not affected by the multiple-level transform.