A Robust Image Watermarking Technique using Gram SCHMIDT Orthogonalization

Abstract

In this thesis, an innovative idea of watermarking technique is proposed based on Gram Schmidt orthogonalization. This technique can provide robust and improved imperceptible images for safeguarding the copyrights. Implanting process in this watermarking system uses certain recurrence locales of DCT to such an extent that inclusion of watermark bits causes the least picture contortion. In this way, the Gram-Schmidt orthogonalization is resolved to insert the watermark in the original picture for obtaining excellent picture quality. During the amendment of watermark into the bits having the specific frequency of the picture, bits involved in watermarking are not straightforwardly embedded into the recurrence coefficient; preferably, there is need to adjust the specific coefficients of the picture that depends on certain principles that builds the watermarking picture. The frequencies which are inserted are controlled by utilizing changed entropy discovering substantial excess territories. Moreover, the watermark is mixed before inserting to give an extra security. So as to confirm the proposed procedure, our strategy is tried. The trial results demonstrate that our procedure accomplishes higher imperceptibility and strength than the existing techniques. The watermark extraction gives more expected results to picture quality after various variety of attacks.