基于视觉掩蔽的隐写不可感知性评价方法  

Imperceptibility Evaluation Method of Steganography Based on Visual Masking

作　　者：方蒙蒙 何加铭[3,2] 史智慧[3,2] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211 [2]浙江省移动网应用技术重点实验室,浙江宁波315211 [3]宁波大学通信技术研究所,浙江宁波315211

出　　处：《计算机工程》2014年第9期167-169,173,共4页Computer Engineering

基　　金：国家科技重大专项基金资助项目(2011ZX03002-004-02);浙江省重大科技专项基金资助重点工业项目(2011C11042);浙江省新一代移动互联网用户端软件科技创新团队基金资助项目(2010R50009);浙江省重点科技创新团队基金资助项目(2012R10009-11);浙江省移动网络应用技术联合重点实验室基金资助项目(2010E10005)

摘　　要：传统的信息隐藏不可感知性评价方法不能全面反映人眼主观感受,以致无法准确衡量隐藏算法的性能。为此,利用人眼感知质量与图像自身均方误差呈线性关系的特点,同时考虑人眼对亮度和纹理的敏感特性,提出一种基于视觉掩蔽的评价方法。给出图像感知质量与图像均方误差之间的线性表达式,根据亮度表达式和梯度分别计算亮度权重系数和纹理权重系数,运用计算所得的权重系数对线性表达式进行线性加权,得到隐写不可感知性评价值。实验结果表明,与峰值信噪比方法相比,该方法得出的评价结果能更准确地反映主观感知质量。The commonly-used methods of imperceptibility evaluation for information hiding algorithms can not express the subjective evaluation comprehensively and evaluate the performance of the algorithms accurately. To solve this problem,a new method based on visual masking is proposed. It combines the linear relationship between the perceptual quality of image and its Mean Square Error（MSE）,and the perceptual properties of texture and luminance,with the aim of improving the perceptual quality. In this method,the linear expression between the perceptual quality and MSE is given,among which the luminance and the gradient can be used to calculate the luminance and the texture weight coefficients respectively. By weighting the expression linearly,a global performance of imperceptibility of the stego image is obtained. Experimental results demonstrate that the proposal outperforms the conventional Peak Signal to Noise Ratio（PSNR）in higher efficiency and realizing the consistency of image quality of subjective and objective evaluation.

关 键 词：数字图像 隐写 不可感知性评价 亮度掩蔽 纹理掩蔽 峰值信噪比 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]