Fragile Watermarking-Based Binary Image Authentication And Tamper Localization Technique

Along with the speeding up of the global information digitalization process and the increasing popularity of e-commerce, e-government, copy tracing of the electronic journals issued online, and integrity authentication of the E-mails,official documents, and fax are pressing issues which need to be addressed.However, most of these documents are binary images.As a result, copyright protection and integrity authen-tication for binary images are gaining importance.Compared with color and grayscale images,binary images that only take two values have great visual contrast between black and white pixels.Any improper modification would result obvious distortion, even change the information represented by the images.Therefore, data hiding meth-ods for gray or color images can not be directly applied to binary images.This paper makes a deep investigation into the existing binary image authentica-tion watermarking, and proposes a novel algorithm for binary images authentication based on their drawbacks.Moreover, a reversible data hiding scheme for binary im-ages authentication is presented for some regions,where accurate re-treatments are needed.1.Binary image fragile authentication watermarking and tamper localization al-gorithm based on error-correcting codes.Image authentication and tamper localization are achieved by embedding the check codes constructed according to the pixels'val-ues in binary image.The suitable places for embedding are limited and unevenly dis-tributed can be handled by low embedding payloads and adaptive adjustments in dif-ferent regions.Furthermore, the visual quality is improved by sufficiently incorpo-rating with the properties of human vision.2.High capacity fragile watermarking for binary image lossless authentication. This novel reversible data hiding scheme is based on pattern substitution.Boundaries of a binary image are chosen as the hiding locations.The embedding capacity is fully exploited by employing interlaced block partition scheme and a variable length em-bedding scheme. Moreover, the side-information for lossless image recovery can be effectively compressed by the Golomb Code incorporating with the occurrence fre-quency of each pattern to achieve higher embedding capacity.This paper will not only provide new methodology and key techniques for binary image authentication watermarking, but also offer an identification technology for the applications,such as medical,military, and legal images etc.The research made in this paper, therefore,plays a very important role in the social stability and develop-ment.