A robust watermarking scheme based on wavelet transform and block SVD

In this paper, we have proposed a robust watermarking scheme for embedding binary watermarks in digital images. In contrast to other wavelet-based watermarking systems which employ human visual system (HVS) for watermark casting, our scheme doesnpsilat need to use HVS characteristics. For embedding procedure, one-level wavelet transform of cover image and one-level binary wavelet transform of watermark are computed. Afterward, each subband of decomposed cover image is permuted randomly and one bit of decomposed watermark is embedded into maximum singular value of a block within its corresponding subband of cover image. Experimental results demonstrate robustness our method against common image processing operations and cropping. Comparison with other methods shows superiority of our method at high compression ratios in JPEG attack.