Image Information Hiding

Technology of digital image information hiding is a hot research topic in recently years.It is different between information hiding base on digital image and traditional encryption algorithm. Images with the confusing will not be attacked than other vectors.The paper discusses three algorithms of digital image information hiding.The groundwork, technological difficult point and innovation that this paper does are as follows:1.The LSB digital image information hiding algorithmResearching a new technology base on traditional LSB algorithms:it gives two random in hiding location,one is the pixel location of the vector image,and the other is each byte minimum four bit of the vector image hiding location.In the hiding capacity,each byte of the vector image will be hided two bits.And it is four times secret information.The secret information will be distilled from the vector image by advancing two random data.2.The information hiding algorithm of digital image scrambling technologyThe key issue of algorithm includes digital image scrambling technology and secret information hiding.That is to say the secret is scrambled at first,and then it is hided.The image scrambling technology algorithm is based on Josephus.Each row of the secret image on the first will be transformed by Josephus,and each column will be transformed by Josephus too.The target of image scrambling has been achieved.The limited passwords of each row and each column are random data,reported the number of initial position can be fixed,or random.The secret information will be hided by transform domain technology,it includes three-step: Firstly,the vector images will be blocked,the size of each block is 8×8.Secondly,each block will be transformed by DCT,and the coefficient matrix will be arranged according to "Z".Finally, the 2 byte intermediate frequency will be analyzed,two consecutive intermediate frequencies will be fixed by o and 1 of secret information,and then the block will be transformed by inverse DCT. At the end algorithm,the secret information of scrambling image has hided in the vector image finally.3.The information hiding algorithm of digital image compression technologyThe run-length encoded(RLE) is a classic coding algorithm;its principle is the number of pixels through the storage and the value of pixels to achieve the purpose of compression.For example,if 888885433333352222144444 is a part of one image pixels,after RLE encoded into: 58151463421154.The PCX image data is coded based on RLE,the algorithm analysis feature of the pixels after compression,finding secret information binary sequence and the relationship between their features。At the end,the secret information will be hided in PCX image.