基于直方图平移和差分直方图的可逆水印  

Reversible Watermarking Based on Histogram Shifting and Histogram of Difference

作　　者：郑淑丽[1] 邢慧芬[1] 王美玲[1] 胡东辉[1] 

机构地区：[1]合肥工业大学计算机与信息学院,合肥230009

出　　处：《系统仿真学报》2013年第11期2717-2722,共6页Journal of System Simulation

基　　金：安徽省自然科学基金资助项目(11040606M138);高等学校博士学科点专项科研新教师基金项目(20110111120005)

摘　　要：基于直方图平移和差分直方图提出了一种可逆水印方案。利用直方图平移的思想解决嵌入水印过程中可能出现的图像像素值溢出问题;计算图像相邻两像素的差分,选择差分直方图最大峰值点两侧的差分值嵌入水印,最大峰值点在嵌入过程保持不变,不需要传输额外信息给接收方用来提取水印;接收方在接收图像以后利用相反的过程提取水印和恢复原始图像。嵌入过程中只是对图像偶数像素细微的改变,奇数像素值不变,因而保持了较高的图像质量,而且该方法计算量小。实验结果证明了本方案具有良好的性能,可以应用于图像认证。In recent years, Reversible Watermarking has been a research hot in Digital Watermarking field. A reversible watermarking scheme was proposed based on histogram shifting and histogram of difference. The problem of overflow or underflow was solved with the thought of histogram shifting in the process of embedding watermarking, Difference of two adjacent pixels was calculated, Both sides of difference of the maximum peak point of histogram of difference were selected to embed watermarking into images; The maximum peak point remains the same in the embedding process, so additional information does not need to be transmitted to the receiving party to extract the watermarking information; The watermark was extracted and the image was restored in the reverse process by receiving side after receiving images. Because the even pixel gray-scale values were modified slightly and the odd pixel gray-scale values remained unchanged, this method can keep high visual quality of test images. Moreover, the proposed method is quite simple and fast. The experimental results show the good property of the proposed scheme. And the scheme can be used for the image authentication.

关 键 词：可逆水印 直方图平移 差分直方图 溢出 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]