Based On The Information Of The Image Steganography Technology

Information hiding techniques can be used in the fields of covert communication, copyright protection, digital receipt anti-counterfeiting, and so on. It's of great value to study them.At present time, most of the studies focus on digital watermarking techniques, and few are done on steganography, one of the most important directions in the field of information hiding. This thesis concerns the steganography. We also place emphasis on its applications in digital images.Firstly, the relative basic knowledges of information hiding are presented, and then the techniques of digital images based information hiding in the domain of spatial and DCT (Discrete Cosine Transform) respectively.In spatial domain, according to the characteristics of HVS (Human Visual System), we introduce several approachs based on images' deviation, images' flatness measurement, fuzzy classification, and an approach based on difference matrix as well.In frequency domain, we research DCT based information hiding techniques, and then give an adaptive technique, and a parity based approach in the DCT domain, and an approach based on improved integration algorithm. We also propose an approach based on difference matrix in DCT domain, and show all the approaches to embed/detect the secret messages, and their robust analysises.