基于小波对比度和模函数的安全密写算法  

A secure steganography algorithm based on wavelet contrast and modulus

作　　者：魏伟一 朱强军 WEI Wei-yi ZHU Qiang-jun(College of Computer Science ＆ Engineering,Northwest Normal University,Lanzhou 730070,Chin)

机构地区：[1]西北师范大学计算机科学与工程学院,甘肃兰州730070

出　　处：《计算机工程与科学》2017年第9期1653-1656,共4页Computer Engineering & Science

基　　金：甘肃省科技计划(1506RJZA130);甘肃省高等学校科研项目(2014B-018)

摘　　要：针对图像隐写中大容量、高保真度和安全性问题,依据人眼对变换剧烈及较暗区域均不敏感的视觉特点,结合模函数周期性运算,提出一种基于小波对比度和模函数运算的高保真图像隐写算法。该方法首先将载体图像按固定大小分块并计算其小波对比度,然后依据小波对比度确定各块嵌入深度,最后采用模函数运算嵌入秘密信息。实验结果表明,该方法能嵌入较多信息和保持良好的载密图像质量。To obtain a larger embedding capacity and better imperceptible stego-images, we propose a new image steganography algorithm using wavelet contrast and modulus operation based on the visual characteristic that humans are not sensitive to rapid changing areas and dark areas. Firstly, the carrier image is divided into blocks with a fixed size and the wavelet contrast is calculated. Secondly, the embedding depth of each block is determined according to the wavelet contrast. Finally, secrete data is embedded into the image through modulus operation. Experimental results show that the proposed approach provides both larger embedding capacity and higher image quality.

关 键 词：图像密写 小波对比度 模函数 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]