A Robust Secured Watermarking Approach Using DCT-DWT & Chaotic Maps

In this paper an efficient digital watermarking technique is proposed for copyright protection. The proposed watermarking algorithm a binary logo watermark security is also maintained by using chaotic map and then after it is embedded by modifying the appropriate subband in the wavelet domain. Level 2 and level 3 wavelet decompositions are utilized to embed the digital watermark. The approach can effectively hide a robust watermark due to the exploitation of the characteristics of the human visual system in wavelet domain. The watermark is detected by comparing the correlations between the wavelet coefficients and the watermarking code at level 2 and level 3 with the stored side information. The performance of the proposed watermarking is robust to a variety of image processing techniques, such as JPEG compression, sharpening, resizing, and geometric operations.