ABSTRACT :

A DIGITAL watermark is a digital signal or pattern inserted into a digital image. Since this signal or pattern is present in each unaltered copy of the original image, the digital watermark may also serve as digital signature for the copies.

Digital watermarking is also to be contrasted with public key encryption, which also transforms original files into another form. Unlike encryption, digital watermarking leaves the original digital data basically intact and recognizable. Digital watermarks are designed to be persistence in viewing, printing or subsequent retransmission or discrimination. Thus, watermarking does not prevent copying but it deters illegal copying by providing a means for establishing the original ownership of a redistributed copy.
Watermarking data for copyright protection is an accepted technique adopted for digital information. This subject has been quite exhaustively researched and several techniques have been established for protecting copyright for still images, audio and video files.
The main aim of this project is to propose a possible new technique for watermarking on images.
Digital Watermarking is a robust and efficient digital image water marking algorithm using the Fast Hadamard Transform is proposed for the copyright protection of digital images. This algorithm can embed or hide an entire image or pattern as a watermark such as a company’s logo or trademark into the original image. The performance of the proposed algorithm is evaluated using the Stirmark, which consists of 90 different types of image attacks. Results show that the proposed algorithm is very robust and can survive most of the stirmark attacks.

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INTRODUCTION

Overview of The Project

PRESENT SYSTEM: -

Digital Watermark is an invisible mark inserted into the digital multimedia data so that it can be detected in the later stage of evidence of rightful ownership. A great deal of research efforts has been focused on digital watermark in recent years. The techniques proposed so far can be divided into two main groups of according to the embedding domain of the container image.

1) Spatial Domain Approach:

One group is SPATIAL domain approach .The earliest watermarking techniques are mainly this kind and the simplest example is to embed the watermark into least significant bits(LSB) of the image pixels. However, this technique has relatively low information hiding capacity and can be easily erased by lossy image compression.

2) Frequency Domain Approach:

The other group is FREQUENCY domain approach. This can embed more information bits and is relatively robust to attacks. They embedded a Guassian distributed sequence into the perceptually most significant frequency components of the container image. Another technique embedded an image watermark into selectively modified middle frequency of discrete cosine transform coefficients. One more algorithm embedded watermark using Fourier transformations that is invariant to image manipulations or attacks due to rotation scaling and translation. Still several methods used to hide the data to the frequency domain such as HVS, JND.

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