Capacity Controllable Location Map Free Reversible Watermarking  

作　　者：HUANG Yuhsiu KUO Juiming HSIEH Wenshyong 

机构地区：[1]Department of Computer Science and Engineering, National Sun Yat-sen University [2]Department of Computer Science and Information Engineering, Cheng Shiu University [3]Department of Computer and Communication, Shu-Te University

出　　处：《Chinese Journal of Electronics》2015年第3期518-523,共6页电子学报（英文版）

摘　　要：Reversible watermarking techniques enable the extraction of the embedding bits from a watermarked image in a lossless way. It exploits the high spatial correlation among neighboring pixels. Application in reversible watermarking includes military and medical images. Images occurs overflow or underflow problems during the imbedding process since pixels value may be out of range [0:255]. Most methods require a location map to solve such problems. A location map free reversible watermarking algorithm is proposed in this study. A prediction threshold value is computed, histogram shifting scheme based on the prediction threshold value to solve overflow and underflow problems. Another threshold value is adopted to achieve capacity control, image quality is better in different payload length with this control. The experimental results reveal that the performance of proposed method outperforms that proposed by FUJIYOSHI et al.Reversible watermarking techniques enable the extraction of the embedding bits from a watermarked image in a lossless way. It exploits the high spatial correlation among neighboring pixels. Application in reversible watermarking includes military and medical images. Images occurs overflow or underflow problems during the imbedding process since pixels value may be out of range [0:255]. Most methods require a location map to solve such problems. A location map free reversible watermarking algorithm is proposed in this study. A prediction threshold value is computed, histogram shifting scheme based on the prediction threshold value to solve overflow and underflow problems. Another threshold value is adopted to achieve capacity control, image quality is better in different payload length with this control. The experimental results reveal that the performance of proposed method outperforms that proposed by FUJIYOSHI et al.

关 键 词：REVERSIBLE WATERMARKING Capacity CONTROL Predicted VALUE HISTOGRAM SHIFTING 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TP309.7[自动化与计算机技术—计算机科学与技术]