Efficiency of BCH codes in digital image watermarking

Nowadays, the copyright laws protecting the digital content are getting quite common. Protecting the original or compressed images against illegal usage can be realized by means of watermarking methods. Nevertheless, various types of attacks are still a problem for many watermarking algorithms. In this paper, we proposed watermarking algorithms for grayscale and color images resisting to many common attacks. The discrete cosine transform (DCT), and block based forward error correction codes (FEC) are used for watermark embedding and extraction. Testing with different kinds of grayscale images demonstrates the robustness of the proposed algorithms to a lot of common attacks and effect of FEC.