计算机工程与应用 ›› 2010, Vol. 46 ›› Issue (2): 154-155.DOI: 10.3778/j.issn.1002-8331.2010.02.046

• 图形、图像、模式识别 • 上一篇    下一篇

新的基于小波对比度的LSB密写

魏伟一1,2,李战明1   

  1. 1.兰州理工大学 电气工程与信息工程学院,兰州 730050
    2.西北师范大学 数学与信息科学学院,兰州 730070
  • 收稿日期:2008-07-28 修回日期:2009-04-03 出版日期:2010-01-11 发布日期:2010-01-11
  • 通讯作者: 魏伟一

New LSB steganographic method based on wavelet contrast

WEI Wei-yi1,2,LI Zhan-ming1   

  1. 1.College of Electrical and Information Engineering,Lanzhou University of Technology,Lanzhou 730050,China
    2.College of Mathematics & Information Science,Northwest Normal University,Lanzhou 730070,China
  • Received:2008-07-28 Revised:2009-04-03 Online:2010-01-11 Published:2010-01-11
  • Contact: WEI Wei-yi

摘要: 利用图像块的小波对比度可以判定图像各像素的LSB(Least Significant Bit)嵌入深度,以提高嵌入容量并保持载密图像的质量。提出了一种新的基于小波对比度的密写方案,将图像块像素的低4位置0后进行小波变换并计算小波对比度作为嵌入深度的判决信息,由嵌入深度逐块逐像素密写。实验结果表明,该方法不仅保持了较高的嵌入容量,而且提取秘密信息时不需任何附加信息。

关键词: 密写, 小波变换, 小波对比度

Abstract: For steganography,using the wavelet contrast to decide the embedding depth in Least-Significant-Bit(LSB) can improve the hiding capacity and maintain a good visual quality of the stego-image.A new method is presented based on wavelet contrast.Firstly,the image is divided into blocks and set the least 4 bits of each pixel as 0,then decomposes with one-level wavelet transform to get the wavelet contrast and obtain the number of bit-planes for embedding.Finally,the secret information is embedded in LSB according to the different embedding length for each image block.The experimental results demonstrate the proposed method can hide large information,while maintain a good visual quality of the stego-image.Meanwhile,the embedded data can be extracted from the stego-image without any additional information.

Key words: steganographic method, wavelet transform, wavelet contrast

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