Application Of Wavelet Transform In Digital Watermarking Technology Of Color Image

Nowadays,multimedia has become the main way of information exchange.It not only saves resources such as time and cost,but also greatly increases the convenience and efficiency of communication.However,with the high level of the development of multimedia,piracy has become an urgent problem to be solved.Increasingly prominent problems such as illegal visits and malicious tampering have brought about greater economic losses,and at the same time have spurred the enthusiasm of creators and affected the development of society.The copyright protection of multimedia has become a real problem that cannot be ignored.Multimedia digital watermarking is to prove the copyright encryption technology of copyright holders by hiding the customized watermark information into multimedia that needs to protect copyright.Compared with the traditional multimedia copyright encryption method,the digital watermark is more convenient and faster.Currently,digital watermarking technology generally embed multimedia information into random signals or binary images,this paper attempts to study its algorithms and watermark images by wavelet transform digital watermarking technology.Firstly,based on the definition of digital watermark,the characteristics of digital watermark,the algorithm of digital watermarking and the attack of digital image watermarking,this paper studies the development of digital watermarking technology,its application in digital image and the existence of digital image watermarking technology.Contradictions and other issues,and explains the importance of wavelet transform in digital watermarking.Secondly,this paper analyzes the wavelet transform Mallet decomposition and reconstruction algorithm,and constructs a wavelet transform bi-orthogonal multi-resolution filter.Finally,two color image watermarking algorithms based on wavelet transform are proposed: single wavelet domain watermarking algorithm and wavelet transform and singular value hybrid watermarking algorithm.The effectiveness,invisibility and robustness of the watermarking algorithms are verified by experimental simulation.In the experimental simulation part,the validity of the algorithms and the invisibility of the watermark are verified by embedding and extracting the watermark information,and the attack of the watermarked image is carried out by operations such as rotation,noise, compression and filtering.In this paper,the watermark correlation is calculated to verify that the algorithms has high anti-interference ability and robustness.