A SECURED AND ROBUST IMAGE WATERMARKING BASED ON PIXEL PERMUTATION, WAVELET TRANSFORM AND SINGULAR VALUE DECOMPOSITION

This paper proposed blind reversible digital image based watermarking technique to combined Singular Value Decomposition (SVD) with Discrete Wavelet Transformation (DWT), to improve data security, robustness and capacity. In this approach, two watermarks are embedded into two different sub-bands of the original image. Initially, we decomposed the original image into four sub-bands using DWT, and again DWT is used on LL sub-band till the third level. Pixel permutation is used to encrypt the QR Code, then encrypt QR code, and logo images are embedded in the third level of LL in LL3 and HL3. After subjecting the watermarked image to various attacks like cropping, rotation, sharpen, adding noise, contrast adjustment and filtering etc., we recovered inserted watermark image from cover image and compared the quality of the recovered watermark by the correlation coefficient. Robustness of the proposed algorithm is comparatively better than some of the previously proposed methods. Various graphs and tables show results in the paper.