基于DCT域的菱形编码图像隐写改进算法  

Improved Image Steganographic Algorithm Based on Diamond Coding in DCT Domain

作　　者：高红霞[1] 

机构地区：[1]河南工程学院计算机学院,河南郑州450007

出　　处：《电视技术》2015年第11期19-22,116,共5页Video Engineering

基　　金：国家自然科学基金项目(71173248)

摘　　要：为提高嵌入秘密图像的信息量和嵌入后载体图像的质量,在行程编码、菱形编码和DCT域的基础上,提出了基于DCT域的菱形编码图像隐写改进算法。采用菱形编码有效地提高了嵌入率,对JPEG标准化量化表进行了改进,更有利于秘密信息的嵌入。对行程编码进行了改进,使秘密图像的压缩效率更大。经过与F5隐写算法对比实验表明,F5隐写算法只能嵌入一幅尺寸为64×64的灰度图像,而改进算法能够嵌入一幅尺寸为240×240的灰度图像,且PSNR>30 d B,大大提高了加密信息的嵌入量,并保持了嵌入后载体图像的质量。To improve the amount of information embedded secret image and the image quality after embedding,the improved image steganographic algorithm based on diamond coding is proposed on the basic of the length encoding,diamond coding and DCT domain.The embedding rate is improved by diamond coding,and the JPEG quantization tables for standardization is improved so that the secret information can be embedded easily.The length encoding is also improved so that the compression efficiency of secret image is greater.The comparing experiments with F5 steganographic algorithm show that the F5 steganographic algorithm can only embed one grayscale image with the size of 64 × 64,and the improved algorithm can embed a grayscale image with the size of 240 × 240,whose PSNR ＞ 30 dB,which can greatly increase the amount of encrypted information embedding and maintain a quality of the image carrier after embedding.

关 键 词：行程编码 菱形编码 离散余弦变换 JPEG标准量化表 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]