Research On Multiple Watermarking Algorithm Based On Elliptic Monogenic Wavelet Transfor

As a means to effectively solve the problems of copyright protection and content authentication,the basic idea of digital watermarking is to embed the normally invisible copyright mark into the carrier information through the watermarking algorithm.When a copyright dispute occurs,the copyright logo is extracted through the reverse operation of the embedding algorithm,and the extracted copyright logo is compared with the original logo to confirm the ownership and integrity of the copyright.In the process of embedding copyright information,in order to ensure the transparency of copyright and the normal use of the image,the existing watermarking algorithms usually choose to embed the binary copyright image with small capacity or only embed one watermark information.Although this can reduce the impact on the carrier image,with the increase of user demand,it is a future trend in the field of digital image watermarking to embed color images by introducing new embedding parameters to enhance the capacity of embedded information on the premise of ensuring image transparency.In view of the above problems,this paper applies the elliptic monomorphic wavelet transform to the design of watermarking algorithm,and proposes two kinds of multi-watermarking algorithms.The main work of the full text is as follows:(1)A dual-color watermarking algorithm by using elliptical monogenic wavelet transform(EMWT)and singular value decomposition(SVD)is proposed.This algorithm applies monogenic wavelet transform to image watermarking technology to introduce new parameters such as amplitude and phase.By improving the watermark embedding ability by extracting amplitude,phase,and direction as parameters.At the same time,after preprocessing the image using Gray Monological Wavelet Transform(GMWT)and EMWT,Arnold transform is used to scramble the watermark,successfully embedding color multiple watermarks in the host image.This algorithm can effectively resist geometric attacks such as rotation and cropping,as well as non geometric attacks such as mean filtering,median filtering,and JPEG compression.(2)In order to further reduce the calculation amount of the algorithm,increase the calculation speed of the algorithm and improve the capacity of the watermark,this paper deleted the calculation process of gray scale single wavelet transform,and added discrete wavelet transform(DWT)to reduce the data loss caused by DCT,and proposed a triple-color watermarking algorithm based on EMWT.After preprocessing the image with EMWT,the embedding of three color watermarks was successfully achieved through amplitude,phase and linear representation.Compared with the double watermark algorithm,the three watermark algorithm not only improves the embedding amount of the watermark,but also improves its running speed and anti attack ability.