The Study Of Watermark Spread Spectum Sequence And The Realizationg Of Digital Watermark Development System

Nowadays, with the rapid development of Internet technology, multimediatechnology and e-commerce, there is growing emphasis on copyright protection justlike pictures, video, audio and other multimedia products. More common protectivemeasures do it by adding common watermarks to multi-media products to showownership of these multimedia products. However, the common watermark will affectthe videos’ and pictures’ showing. In recent years, many experts and scholars putforward a new method about digital media protection, which is the digitalwatermarking technology. It is to embed copyright information into multimedia datayet without being discovered, but you can check it out, so as to achieve the purpose ofcopyright protection.The first part of this article will do some study about the watermark spreadspectrum sequence. First we do some study about the autocorrelation andcross-correlation of the spread spectrum sequence, such as normal sequence, msequence, LS sequence, Gold sequences, Walsh studied. Then by testing theautocorrelation of each sequence after different attacks, we study the resistance ofeach sequence under various attacks.The second part of this paper describes the realization of the digital watermarkdevelopment system. Digital watermarking program designing often use the Matlabfor algorithm design. Matlab can do better service with its own characteristics in thestudy of digital watermark technology. However, Matlab is just a simulation tool thatused for scientific researching, which is not suit for the project, firstly we addressthis problem to realize a special programming system for the development of digitalwatermarking, that is the digital watermarking development system. The system isbased on.NET framework and image processing functions of Matlab. We realize avariety of image processing functions with C#which is used in the development ofdigital watermarking procedures, so it can achieve the same effect of computingfunctions of Matlab with a higher Operation efficiency. In addition, I have realized aplatform to execute the digital watermarking procedure. The system also includes twoother functions, which are attacking function and detecting function. The attackingfunction can do various of attacks to the picture, while the detecting function candetect the watermark from the pictures, and generating a test report.