An oblivious fragile watermarking scheme for images utilizing edge transitions in BTC bitmaps

作     者：ZHANG Yong1,LU ZheMing2 & ZHAO DongNing1 1ATR National Defense Technology Key Laboratory,College of Information Engineering,Shenzhen University,Shenzhen 518060,China 2School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China 

作者机构：ATR National Defense Technology Key Laboratory College of Information Engineering Shenzhen University Shenzhen China School of Aeronautics and Astronautics Zhejiang University Hangzhou China 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2012年第55卷第11期

页      面：2570-2581页

核心收录：

学科分类：0839[工学-网络空间安全] 08[工学] 081201[工学-计算机系统结构] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by National Science & Technology Pillar Program (Grant Nos. 2011BAH20B02,2011BAH20B03) Natural Science Foundation of SZU (Grant No. 201215) National Natural Scientific Foundation of China (Grants Nos.61003255,61171150) 

主　　题：fragile image watermarking oblivious watermarking block truncation coding data hiding image authentication 

摘      要：As one of the famous block-based image coding schemes,block truncation coding(BTC) has been also applied in digital *** BTC-based watermarking or hiding schemes usually embed secret data by modifying the BTC encoding stage or BTC-compressed data,obtaining the watermarked image with poorer quality than the BTC-compressed *** paper presents a new oblivious image watermarking scheme by exploiting BTC *** the traditional schemes,our approach does not really perform the BTC compression on images during the embedding process but utilizes the parity of the number of horizontal edge transitions in each BTC bitmap to guide the watermark embedding and extraction *** embedding process starts by partitioning the original cover image into non-overlapping 4×4 blocks and performing BTC on each block to obtain its BTC *** watermark bit is embedded in each block by modifying at most three pixel values in the block to make sure that the parity of the number of horizontal edge transitions in the bitmap of the modified block is equal to the embedded watermark *** the extraction stage,the suspicious image is first partitioned into non-overlapping 4×4 blocks and BTC is performed on each block to obtain its ***,by checking the parity of the number of horizontal edge transitions in the bitmap,we can extract one watermark bit in each *** results demonstrate that the proposed watermarking scheme is fragile to various image processing operations while keeping the transparency very well.