J. Chandrasekhar Rao, K. Ujwal Deep, Suneel Mudunuru, Asst.Professors of ECE dept have authoured a paper and was published in International Journal of Advances in Science and Technology
this paper, a robust and blind image watermarking scheme in contourlet domain
based with singular value decomposition is proposed for multimedia copyright
protection. In contrast to traditional methods where the watermark bits are
embedded directly on the contourlet transform coefficients, the proposed scheme
is based on watermark bits embedding on the singular value of the selected
blocks within lowpass subband of the original gray image contourlet transform.
Experimental results demonstrate that the quality of watermarked image is
robust against attacks such as JPEG compression, lowpass filtering, noise
addition, scaling and cropping. Watermark extraction is efficient and blind in
the sense that the original image or original watermark is not required.
Keywords: Contourlet Transform, Digital Image Watermrking, Singular
Value Decomposition, Lowpass Subband, Quantization Strategies