Blind Watermarking Algorithm Based On Wavelet Transform

Along with the development of Internet and Communicationmultimedia techniques, copyright protection of multimedia has becomeincreasingly prominent. More and more people pay attention to thewatermarking technologies. It is the most effective method of copyrightprotection question at present. Whereas the maturity of the wavelettechnology and its advantage in image processing field, a deep researchof digital image watermarking technology based on wavelet domain isdone in this paper.This paper analyzes the digital image watermarking technology andits typical algorithm, discusses the attack and performance evaluationmethods of digital image watermarking. In view of the current researchstatus and problems, this article focuses on how to select the location ofthe watermark, how to adopt embedded strategies and blind extractionmethod of watermark.1. A new blind wavelet domain watermark algorithm based on EZWstructure and SVD is proposed. In the low frequency detal bands, thisalgorithm adopts the EZW structure principle to embed the watermark, Inthe high frequency, uses the Stability of SVD to embed the watermark. So,this alogorithm is more robust under various attack than the traditionalgorithm. Meanwhile, this watermark also has the larger capacity.2. A new blind watermarking algorithm of color images based on in-teger wavelet transform and wavelet texture blocks is proposed. Integerwavelet transform can map integers into integers, which reduces the errormade by floating numbers. Considering of the brightness and image textture masking characteristics of human visual system, this algorithm usessubblock technology on the basis of integer wavelet transform. It choosesthe high brightness and high texture wavelet blocks to implant watermark,so the invisibility of the watermark image is improved. It also achievesmultiple watermark embedding. Experiment results indicate it is aneffective blind color images algorithm.