Efficient color image watermarking using homomorphic based SVD in DWT domain

This paper proposes a robust image watermarking approach using homomorphic based SVD in the DWT domain. The DWT is utilized to divide the host image into non-overlapping bands. The reflectance component of sub-band LL is extracted using homomorphic transform for each color (red, green and blue). The embedding watermark is done by applying SVD on the reflectance component of the sub-band LL. The results of the proposed watermarking approach are compared with those of the other traditional approaches. Evaluation is based on visualization, Peak Signal-to-Noise Ratio of watermarked image (PSNR), Normalized Correlation of watermark after detection (NC). Experimental results ensure that the proposed watermarking approach is both robust and immune to attacks studied in this paper compared with the other traditional approaches.