SYNOPSIS OF DIGITAL WATER MARKING-

Discrete Cosine Transform(DCT) andDiscrete Wavelet Transform(DWT)

MADE BY:

ANSHUL ARORA – 1751152808MADHURIMA KUMAR – 1801152808ATIREK GUPTA – 1821152808PRAGATI MALIK – 1831152808

(ECE-2 , 3rd year)

INTRODUCTION

Watermark is a recognizable image or pattern in paper used to identify authenticity. Digital watermarking is the process of embedding information into a digital signal in a way that is difficult to remove. The signal may be audio, pictures or video.It is the process by which identifying data is woven into media content such as images, movies, music or programming, giving those objects a unique, digital identity that can be used for a variety of valuable applications. Imperceptible to the human senses yet easily recognized by special software detectors, a digital watermark remains constant even through recording, manipulation and editing, compression and decompression, encryption, decryption and broadcast — without affecting the quality of the content.

NEED FOR WATER MARKING

The piracy of software, images, video, audio, and text has long been a concern for owners of these digital assets. Protection schemes are usually based upon the insertion of digital watermarks into the data. The watermarking software introduces small errors into the object being watermarked. These intentional errors are called marks, and all the marks together constitute the watermark. The marks are chosen so as to have an insignificant impact on the usefulness of the data and are placed in such a way that a malicious user cannot destroy them without making the data significantly less useful.

APPLICATIONS

Digital Watermarking can be used for a wide range of applications such as:

Copyright protection Source Tracking (Different recipients get differently watermarked

content) Broadcast Monitoring (Television news often contains watermarked

video from international agencies) Covert Communication

ABSTRACT OF THE MINI PROJECT

This mini project introduces the algorithm of digital watermarking based on Discrete Cosine Transform(DCT) and Discrete Wavelet Transform(DWT). According to the characters of human vision, in this algorithm, the information of digital watermarking which has been discrete Cosine transformed, is put into the high frequency band of the image which has been wavelet transformed. Then distils the digital watermarking with the help of the original image and the watermarking image. The simulation results show that this algorithm is invisible and has good robustness for some common image processing operations.