Still Image Watermarking Algorithm

In recent years, the rapid development of digital technology and Internet has greatly enlarged the interest scope of digital products of its legal owners. However, the crisis of Copyrights Protection is also coming out. Because of the easily reached and copied digital products such as: image, video and audio make it possible that a massive illegal copyrights action would be got worse than right now. And the problem can't be dealt only with the traditional cryptology. So, for these reason a meaningful research direction-Digital Watermarking came out. Just like the watermark in bill, digital watermark is a marker which embedded into digital products by using digital manipulation and without perception for human visional system. It can be used as the attestation for its original owner for copyright arbitration when an application of litigation happens. At the same time, it also can be used to protect the integrality of the digital information by the way of checking and analysis.Firstly, this paper review the digital watermarking technologies such as : development history, current status, digital watermark classification , traditional algorithm etc. Then this paper present an algorithm based on color redundancy in RGB image color space.JPEG2000 based on its core technology — Wavelet transform is a brand new still image compression standard with several choiceness characteristics such as: high encoding efficiency, supporting gradual encoding, flexibility of coding currents managing which adapt to Internet a lot. So secondly, paper present two scheme based on the algorithm in DWT , With the consideration of HVS makes more information embedded into the digital product, at the same time balance the robustness and transparence. A: binary image algorithm with Arnold scrambling;B: double functional watermark in DWT .This is another two schemes this paper presented.