Watermarking (Chiou

Abstract: The rapid expansion of the Internet and the overall development of digital technologies in the past years have sharply increased the availability of digital multimedia content. One of the great advantages of digital data is that it can be reproduced without loss of quality. However, it can also be modified easily. In many contexts, such for legal evidence and for video security systems, any modifications of image, video or audio data have to be detected. Therefore, some work needs to be done in order to develop security systems to protect the information contained in digital data (Cox, 1997).Watermarkin