大容量的预测误差差值扩展可逆数据隐藏算法  

High capacity reversible data hiding algorithm based on prediction error difference expansion

作　　者：熊志勇[1] 王江晴[1] 

机构地区：[1]中南民族大学计算机科学学院,湖北武汉430074

出　　处：《光电子．激光》2010年第5期743-748,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60975021)

摘　　要：将Tian差值扩展技术应用于彩色图像,提出一种大容量的基于预测误差差值扩展(PEDE)的彩色图像可逆数据隐藏算法。针对传统差值扩展技术存在过分修改像素值、嵌入容量受定位图制约等缺点,首先利用色彩分量之间的相关性减小差值,并将较小的差值扩展量分散到2个色彩分量中;其次采用LSB替换方法嵌入数据,将差值扩展变换与数据嵌入过程分离,从而减少不可扩展差值的数量;最后利用差值的二次可扩展性定位不可扩展差值,并用少量的标志信息代替定位图,从而提高嵌入容量。提取端在提取信息后可根据需要无损地恢复原始图像。实验结果表明,本文算法在保证图像质量的同时,嵌入容量有较大的提高。A high capacity reversible data hiding algorithm for color images based on prediction error difference expansion is proposed.To avoid the drawback of Tian′s algorithm which must embed a location map and the quality decline of stego-images from excessive modulation to pixels,this algorithm uses the correlation of color components to decrease difference and disperse smaller expansion to two components,and uses LSB replacing method to separate the process of difference expansion and data embedding,so the quantity of un-expandable difference is decreased.Final,the method uses twice expandability of difference to locate un-expandable difference,and embeds a few indicate flags instead of location map,so the payload capacity is increased.Experimental results show the payload capacity and the quality of stego-image is significantly improved compared with other new or classical algorithms.

关 键 词：可逆数据隐藏 预测误差差值扩展(PEDE) 定位图 LSB替换 失真控制 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]