Research Of Information Hiding Technique Based On Human Visual Gray Sensitivity

Information hiding technique has become a hot research at home and abroad at present. It is information hiding technique that embediding digital, serial number, text, images signs and other copyright information into the multimedia datas in order to work for copyright tracking and copyright protection. In addition, it has important applications on authenticity of identification, covert communication, implicitly signs, electronic authentication.Information hiding can be divided into spatial information hiding and transform information hiding. By a careful analysis of research situation and defects of spatial and transform information hiding, a new algorithm model was put forward, and verified by a large number of ecperiments.In information hiding techniques of spatial domain, based on human visual gray sensitivity, a fragile large capacity spatial domain information hiding algorithm, and a new calculation formula of image peak signal-to-noise ratio were put forward. An adaptive embedding method was proposed, which had the minimum visual gray sensitivity when massive information were hidden into an original image. The algorithm in this paper which based on human visual gray sensitivity has good performance. The amount of secret information can be increased with this algorithm, and it can resist some attacks in some way. Experiments show that, the algorithm has much improvement compared with some algorithms such as LSB and BPCS. If embedding the same amount of watermarking information, this paper's algorithm has a better transparency, smaller distortion as well as certain ability to resist some attacks. If the visual effects of the carrier images are the same, the amount of secret information with the algorithm of this paper would be much more than other algorithms. And what's more, once there is a bit tampered randomly, the watermarking image could not be recovered correctly. So it was suitable for the situation where the received information must be very strict reliably.In information hiding techniques of transform domain, based on entropy, a semi-fragile digital watermarking technology was put forward. The embedding intensity of the secret information in different regions was described accurately and turely in the form of image information entropy. This algorithm measured the amount of sensitivity information carried by the carried image with the image information entropy, building the connection with human visual gray sensitivity. A technique of image embedding regions dynamic segmentation based on two-dimensional discrete wavelet transform was proposed. a large number of experiments showed that this segmentation technique had good performance. And a great amount of experiments has showed that this semi-fragile watermarking algorithm, which combined image information entropy with image embedding regions dynamic segmentation technique, had good performance, just like better visual masking characteristics, better robust, stronger anti-attacking and so on. After the carried image was attacked, even the watermarking tempering rate was zero.