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doi:10.3969/j. issn. 1009 3230.2018.09.013
应用能源技术
2018年第9期(总第249期)
基于VQ压缩图像的动态排序隐写算法信息技术分析
崔青剑
(上海理工大学光电信息与计算机工程学院,上海200093)
摘要:隐写术是一种利用数据完余将信息隐藏到数宇媒体中的安全的通信技术,实现隐藏通信的目的。不可感知性和藏量是隐写术中最重要的两个指标。文中首先使用动态排序算法来重新布置失量量化(VQ)压缩的码本,所提出的隐写算法造成的失真更少。使用重新排序的码本,秘密信息被隐藏在失量量化压缩图像中。提出的算法通过减小码本中的相邻码字之间的距离,提高了写后秘密图像的质量。实验结果表明,与现有算法相比,所提出的算法提高了图像的峰值信噪比(PSNR)约3dB。
关键调:动态排序:图像压缩;隐写术:向量量化
中图分类号:TN919.81
文献标志码:A
文章编号:1009-3230(2018)09-004006
InformationTechnologyAnalysis of Dynamic Sequencing Algorithm
for Steganography Base on VQ Compressed Images
CUI Qing - jian
(School of Optical Electrical & Computer Engineer, University of Shanghai for Science
& Technology, Shanghai 200093, China)
Abstract: Abstract: .Steganography is a kind of secure communication techniques that uses the data redundancy to hide the information into digital media, achieving the aim of imperceptive communication.Imperceptibility and capacity are two of the most important performances in steganography. In this paper, the dynamic sequencing algorithm is first employed to rearranges the codebook of the Vector Quantization (VQ) compression, allowing less distortions being caused by the proposed steganographic scheme. Using the rearranged codebook, the secret message is hidden in vector quantization compressed images. By decreasing the distance between the adjacent codewords in the codebook, the quality of the stego image is improved by the proposed scheme. Experimental results showed that the proposed algorithm improves the peak signal to noise ratio (PSNR) of the stego image about 3 dB by average compared to the existing algorithms.
Key words: Dynamic sequencing; Image compression; Steganography; Vector quantization
0引言
隐写术[1]是在数字媒体中隐藏秘密消息,以实现安全通信的目的。由于对信息安全(2]的需求不断增长,在[3]中,提出了一种基于隐写的信息保护方法(SBIPM),其使用密码学{4)和隐写术
收稿日期:20180426修订日期:201806-18 作者简介:崔青剑(1992-),男,安散宣披人,硕士研究生,
研究方向为隐写术。
万方数据
的整合来提高信息的安全性。随着数据隐藏研究的迅速发展,许多隐写算法已被提出[5-6]。在空间域中,最低有效位(LSB)算法(7]用一个秘密比特代替像素灰度值的最低有效位。Tian提出了差值扩展(DE)算法("),其通过扩展两个相邻像素的差值来嵌入秘密位。EzStego[9]根据亮度信息重新排列像素,将秘密消息比特与像素的位置相匹配。然而,这种方法会导致严重的图像失真。后