Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Novel Image Data Hiding Scheme with Diamond Encoding | Hindawi Publishing Corporation EURASIP Journal on Information Security Volume 2009 Article ID 658047 9 pages doi 2009 658047 Research Article A Novel Image Data Hiding Scheme with Diamond Encoding Ruey-Ming Chao 1 Hsien-Chu Wu 2 Chih-Chiang Lee 3 and Yen-Ping Chu4 1 Graduate Institute of Information and Social Science National United University 1 Lienda Miaoli 360 Taiwan 2 Graduate School of Computer Science and Information Technology National Taichung Institute of Technology 129 Section 3 San Min Road Taichung City 404 Taiwan 3 Department of Computer Science and Engineering National Chung Hsing University 250 Kuo Kuang Road Taichung City 402 Taiwan 4 Department of Computer Science and Information Engineering Tunghai University 181 Section 3 Taichung Port Road Situn District Taichung City 407 Taiwan Correspondence should be addressed to Hsien-Chu Wu wuhc@ Received 1 August 2008 Revised 29 November 2008 Accepted 20 March 2009 Recommended by Andreas Westfeld A novel data hiding scheme in digital images with the diamond encoding by pixel value adjustment is proposed. The proposed method is the extension of the exploiting modification direction EMD embedding scheme. First the process of embedding partitions the cover image into nonoverlapping blocks of two consecutive pixels and transforms the secret messages to a series of k-ary digits. For each block the diamond encoding technique is applied to calculate the diamond characteristic value and one secret k-ary digit is concealed into the diamond characteristic value. The diamond characteristic value is modified to secret digit and it can be obtained by adjusting pixel values in a block. This scheme is designed in such a way that the distortion of each block after diamond encoding is never out of the embedding parameter k and the block capacity is equal to log2 2k2 2k 1 . The diamond encoding provides an easy way to produce a more perceptible result than those yielded by simple least-significant-bit .
