Title: Entropy based Robust Watermarking Scheme using HADAMARD Transformation Technique
Abstract: As a novel watermarking algorithm is required to protect copy rights of digital data entropy based robust watermarking scheme using Hadamard transformation technique is proposed in this paper.The proposed technique can hide an entire image or pattern as a watermark directly into the original image.As the quality of the image is to be preserved the entire image is not altered for embedding, instead few blocks are used based on the size of the watermark and information content of an image block.To reduce the computational complexity of the proposed algorithm Hadamard transformation is used for converting cover image from spatial domain to transform domain.The proposed algorithm is tested with Lena grey scale image of size 256x256 and watermark of size 64x64 using mat lab software.The experimental results show that the proposed scheme is robust to random noise addition attack, resize attack and cropping attack.