分块自适应JPEG图像数据隐藏算法  

Block-adaptive data hiding algorithm for JPEG images

作　　者：龚发根[1] 秦拯[2,3] 

机构地区：[1]广东科学技术职业学院计算机系,广东珠海519090 [2]湖南大学软件学院,长沙410082 [3]东莞理工学院,广东东莞523808

出　　处：《计算机应用研究》2010年第10期3883-3884,3888,共3页Application Research of Computers

基　　金：湖南省自然科学基金资助项目(09JJ3124);广东省自然科学基金资助项目(7007730);广东省科技计划项目(0711020400157);东莞市科技项目(2006101101032)

摘　　要：为提高隐秘JPEG图像视觉质量与隐藏容量,在修改JPEG缺省量化表的前提下,针对JPEG图像提出一种自适应数据隐藏算法。该算法首先根据图像分块视觉特性确定用于数据隐藏的图像分块,然后应用LSB替换方法修改DCT域量化后AC系数以嵌入秘密数据。实验结果表明,该算法在保证较好透明性的同时,显著提高了JPEG图像隐藏容量,与其他同类算法相比,隐藏容量提高约21%。该方案可为互联网环境图像实时通信提供安全保障手段。To improve the visual quality of the JPEG stego-image and the hiding capacity,this paper proposed an adaptive da-ta hiding algorithm for JPEG images,which needn’t to modify the default quantization table. The proposed algorithm first se-lected the sub-block for data embedding according to visual perception features of the image sub-block. Then embedded the se-cret data into the quantized AC coefficients in DCT domain with the LSB substitution. Extensive experimental results show that this algorithm has enhanced remarkably the hiding capacity of JPEG images while achieves good transparency. The proposed scheme has 21% higher hiding capacity when compared with existing algorithms for JPEG image,and can provide an effective solution to the security of real-time image communications over the Internet.

关 键 词：数据隐藏 JPEG图像 DCT系数 分块自适应 人类视觉系统 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]