Information Hiding And Digital Watermarking Research Based On Information Products Of Mapping

Information hiding not only is a new area of information security,but also is an effective way to protect information security.With the continually perfection of the information hiding and digital watermarking technology in practical applications, information hiding techniques have important application value in practice.At present, China has gradually realized the conversion and bounds from traditional mapping technology system to digital mapping system.Information-based mapping is achieving right now and the corresponding mapping information products are increasing.Many information of the Digital Mapping are images products,so the modern surveying and mapping industry is an integral part of information industry.As an important direction of the information management,information security development,Information hiding technology will play an impantant role in surveying and mapping information management.This paper researches the practical application of the hiding technology and digital watermarking technology in mapping image information.Based on the analysis of the gray image structure widely used in mapping image and the characteristics of human vision,the paper the completed the following work:(1) Based on the analysis to the trend of the grayscale in the bitmap,this paper presents a±k algorithm which can improve the LSB algorithm.Applying trend of a set of pixels(two) intensity and±k algorithm change,the least significant bit of gray value,the information hidding will not change trend of the image intensity,at the same time it can also reduce variation rate of least significant bit and enhance the robustness.(2)This paper presents an improved digital watermarking algorithm based on adjacent variance,Using pixel transform method to transform 4×4 neighborhood to 3×3 neighborhood can increase uncertainty of information embedding and can improve concealment of the information hiding and enhance robustness.Using Visual Basic6.0,the paper carries out programming and gives the process and the main code and the paper carrys on analysis and summary to experiment results.Finally,as the thesis of to hide information is summarized and prospects and give further research objectives.Information hiding technology which is based on digital watermarking is summarized and predicted and further research goals are given.