WADIA: An efficient algorithm for watermarking of images with abrupt intensity variations

Abstract

The growth of computer networks has propelled the transformation from conventional libraries to digital libraries. At the same time it has also lead to piracy and illegal distribution of the content. This has given rise to the need for the owner of the content to use watermarking. In our paper we present an efficient visible watermarking algorithm for images using DCT (Digital Cosine Transform). We have named it WADIA (Watermarking Algorithm in DCT for Images with Abrupt intensity variations).This algorithm proves to be efficient especially for images with sharp intensity variations and double edges. Also this algorithm uses a Gaussian filter before detecting the edges that reduces the random noise in the image thereby limiting the false edges. For designing this algorithm we have made use of a Human Visual System (HVS) which considers the characteristics of perception of the human eye. We have also presented the experimental PSNR (Peak Signal to Noise Ratio) values of this algorithm along with those of various other algorithms that use first order edge detection methods.

Publication Title

Proceedings of the 2008 International Conference on Image Processing, Computer Vision, and Pattern Recognition, IPCV 2008

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