Research In Digital Watermarking Technology Based On Tetrolet Transform And SVD

With the rapid development of multimedia technology and network technology,the communicating of information has been accelerated.But information security problem is increasingly outstanding.As an important means of copyright protection,digital watermarking technology has become a research hotspot.Nowadays digital watermarking algorithm cannot keep a good balance between invisibility and robustness.As a result of this,the application of the digital watermarking technology has been limited in daily life.This paper puts forward a digital watermarking technology based on Tetrolet transform and singular value decomposition(SVD),in view of the QR code image is easily affected by noise and geometric attacks.The main research work is divided into the following:1.Respectively studying the application performance of the Tetrolet transform and SVD on the digital watermarking technology and combined with the characteristics of QR codes,a new watermarking algorithm has been proposed.Compared with the traditional watermarking algorithm,the new algorithm has a strong ability to resist noise and geometric attacks.It implements the improvement of the robustness and invisibility significantly on the basis of the effective decoding of the QR codes.2.This paper designs the embedding and extraction algorithm of the watermark system.By using the sparse representation and the geometry features of the Tetrolet transform,the energy information is concentrated in the Tetrolet coefficients,and then decomposing the coefficients by SVD as the anti-interference ability of the SVD.The watermark information is embedded in the matrix singular value.According to the results of the simulation experiment,the algorithm has good robustness and invisibility in the fight against noise,shearing,rotation,translation and other attacks.