A New Introduction towards Invisible Image Watermarking on Color Image

Abstract

Easy availability of internet, together with relatively inexpensive digital recording and storage peripherals has created an era where duplication, unauthorized use and maldistribution of digital content has become easier. To prevent unauthorized use, misappropriation, misrepresentation; authentication of multimedia contents achieved a broad attention in recent days. In this regard we've already introduced a technique for invisible image watermarking for color image authentication. In this paper we propose a method for embedding color watermark image to color host image in a more efficient manner. We introduce a new arena of embedding color watermark image to different positions of color host image in this paper. The host image is simply divided into some blocks so that as per our proposed technique we are able to embed watermark at LSB of all such blocks. and perceptually it is entirely invisible to human visual system. In proposed watermarking framework, it allows a user with an appropriate secret key and a hash function to verify the authencity, integrity and ownership of an image. If the user performs the watermark extraction with an incorrect key and inappropriate hash function, the user obtains an image that resembles noise. So that authencity will not be preserved even if a single pixel of the image is changed. This embedding method is beneficial to us at the watermark extraction end. We are using blind extraction method. At the time of extraction the watermark can easily be resolved combining LSB from different blocks of the watermarked image.