计算机工程

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基于视觉感知与菱形编码的图像隐写算法

金 涛1a,2,何加铭1b,2,杨任尔1b,2,曾兴斌1b,2,樊玲慧1b,2   

  1. (1. 宁波大学a. 信息科学与工程学院; b. 通信技术研究所,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)
  • 收稿日期:2013-09-16 出版日期:2014-10-15 发布日期:2014-10-13
  • 作者简介:金 涛(1989 - ),男,硕士研究生,主研方向:图像隐写算法;何加铭,教授;杨任尔、曾兴斌,副教授;樊玲慧,硕士研究生。
  • 基金项目:

    浙江省移动网络应用技术重点实验室基金资助项目(2010E10005);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, 2012R10009-20);浙江省重大科技专项重点工业基金资助项目(2011C11042)。

Image Steganographic Algorithm Based on Visual Perception and Diamond Encoding

JIN Tao 1a,2,HE Jia-ming 1b,2,YANG Ren-er 1b,2,ZENG Xing-bin 1b,2,FAN Ling-hui 1b,2   

  1. (1a. College of Information Science and Engineering;1b. Institute of Communication Technology,Ningbo University,Ningbo 315211,China;2. Key Laboratory of Mobile Internet Application Technology of Zhejiang Province,Ningbo 315211,China)
  • Received:2013-09-16 Online:2014-10-15 Published:2014-10-13

摘要:

为提供较大的隐写容量和保持良好的载密图像质量,提出一种基于视觉感知和菱形编码的图像隐写算法。根据人类视觉系统,针对人眼对图像的高中低灰度区、纹理区及平滑区的敏感度的不同,在不同区域选择嵌入不同数量的秘密信息;同时为了尽可能减少对图像像素值的改变,采用改进的菱形编码来嵌入秘密信息。实验结果表明,与HVS-OPAP 算法相比,该算法图像的嵌入容量提高了4. 09% ,获取的隐写图像具有更好的不可感知性,同时峰值信噪比平均提高了1. 5 dB,而且该算法具有抗RS 隐写分析能力,安全性更高。

关键词: 隐写术, 容量, 人类视觉系统, 像素值, 菱形编码, RS 隐写分析

Abstract:

In order to provide larger capacity of the hidden secret messages and maintain a good visual quality of stegoimage, a novel image steganography based on visual perception and Diamond Encoding(DE) is proposed. According to the Human Visual System(HVS),human eyes have different sensitivity on high gray areas,middle gray areas and low gray areas,texture areas and smooth areas. The different amounts of secret messages are embedded in the different areas of cover images. Especially,the modified DE is used to minimize the change of the image pixel value. Experimental results show that the proposed method can effectively improve the embedding capacity than HVS-OPAP algorithm by 4. 09% , while stego-image has better imperceptibility,PSNR average of 1. 5 dB,and RS steganalysis methods can not detect whether the secret information is embedded,so it has a better security.

Key words: steganography, capacity, Human Visual System ( HVS ), pixel value, Diamond Encoding ( DE ), RS stegannalysis

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