Research On Digital Watermarking Technology Of Remote Sensing Image Based On Two-dimensional Code

Remote sensing image is one of the main data sources of geospatial informat io n,witch has important research and application value.Both in the national economic development or national defense construction,Remote sensing image have played a huge role.With the advent of the information age,remote sensing image data security and copyright issues have become increasingly serious.And the current security encryption measures,also can not effectively prevent and combat a variety of ile gal acts.As a new information security technology,digital watermarking technology provides an effective solution for remote sensing image security.Digital watermarking technology refers to embedding secret watermark information in the data,making it part of the source data inseparable,Whereby the copyright attribution is determined.The digital watermarking models and aigorithms for remote sensing image are studied.The main results are as follows :(1)This paper introduces the basic situation of digital watermarking technology,research status and application.Based on the essential characteristics of remote sensing image,the characteristics and requirements of digital watermarking technology of remote sensing image are expounded,and analyzes the feasibility and applicatio n advantages of two-dimensional code as watermark.(2)Based on the analysis of the characteristics of remote sensing image,a watermarking algorithm of high load remote sensing image based on DCT transform domain is proposed.The algorithm realizes the precision control of the original data,and satisfies the requirement of data availability of remote sensing image watermarking technology.(3)Aiming at the geometric attack of remote sensing image,an anti-geometric attack remote sensing image watermarking algorithm based on SIFT feature detection is proposed.Geometric distortion correction is performed by image SIFT feature detection,which effectively restores the synchronization of watermark information and improves the anti-geometric attack capability of watermarking algorithm.(4)Based on the study of zero watermarking,a zero-watermarking algorithm for remote sensing image based on discrete wavelet transform DWT is proposed.DWT wavelet decomposition is performed on the original image,the zero watermark is constructed by extracting the coefficient features of its transform domain.Logistic chaos encryption technique is used to generate the extraction sequence randomly,which increases the security of watermarking algorithm.In the process of watermark extraction,a quadratic detection scheme of watermark image is proposed,which improves the robustness of the algorithm effectively.