Invisible watermarking for copyright protection [articol]

Abstract

Due to the rapid expansion of the Internet and the overall development of digital technologies, millions of users, who are scattered all over the world, are able to use a vast number of multimedia products. Every participant in this process wants to assert their rights, which are given by their role in the business string. Naturally, solutions to digital copyright protection are required urgently to tackle the problem of unauthorized copying and distribution. The aim of this paper is concerned with inserting copyright information into host image. In this paper, discrete cosine transform (DCT) domain watermarking technique for copyright protection of still digital images is analyzed. The DCT is applied in blocks of 8 × 8 pixels as in the JPEG algorithm. The watermark can encode information to track illegal misuses concerned with the protection of copyright information contained in digital images.