A HYBRIDIZED APPROACH FOR MOTION VECTOR SELECTION USING ROUGH SET AND PARTICLE SWARM OPTIMIZATION IN VIDEO WATERMARKING

Abstract

With the advancements in the technology the communication between the two parties has witnessed the security distortion tremendously in recent years. The communication involves the exchange of the data consisting of textual documents, images and video files. To provide copy protection and copyright protection for digital audio and video data, two complementary techniques are being developed: encryption and watermarking. The encryption algorithms have been developed earlier for the transmission such information over the internet and other media safely. But these algorithms have proved to be inefficient in providing complete security for data exchange. The generation of the keys for encrypting and decrypting the data has become time consuming. The storage of keys requires huge memory space and the transmission of such keys gets distorted with introduction of the intruders to the communication systems. Even after the receiver has received and decrypted the data, the data is not clear and no longer protected. The watermarking systems have been developed for better security of the data. Watermarking techniques can complement encryption by embedding a secret imperceptible signal, a watermark, directly into the clear data. In these techniques, the cover-image is used to hide the secret information and the stego-image is the cover- image with the secret data embedded inside. It hides the secret information in general files secretly first and then transmits these files through network, because they look the same as general files, they can escape from the attention of illegal interceptors easily and therefore the secret information is not easy to be attacked. A digital watermark is in fact a piece of information inserted and hidden in the media content. This information is imperceptible to a human observer but can be easily detected by a computer. The watermarking is well-suited for the protection of multimedia content.