标题: 资讯隐藏技术于数位内容保护之研究
A Study of Information Hiding Techniques on Digital Content Protection
作者: 柳晓龙
袁贤铭
林家祯
Liu, Xiao-Long
Yuan, Shyan-Ming
Lin, Chia-Chen
资讯科学与工程研究所
关键字: 资讯隐藏;秘密通讯;浮水印;区块截短编码;向量量化编码;离散小波转换;版权保护;图像认证;Information hiding;Watermarking;Data hiding;Copyright protection;Image authentication;Search order coding (SOC);Vector quantization (VQ);Block truncation coding (BTC);Discrete wavelet transform (DWT)
公开日期: 2016
摘要: 网际网络的蓬勃发展,彻底颠覆了人类传输资讯的方式,越来越多的数位化内容已通过公开渠道传播。由于合法和非法用户可以方便地访问数位内容,网路上传输的数位内容很容易遭受恶意的攻击,因此数位内容的安全和保护问题应该得到更多的关注。为了保障数位内容的安全传输,资讯隐藏技术已经成为近几年研究的一个重要议题。在本文中,为保护不同的数位内容,我们分别针对机密资讯传输和数位图像保护方面提出了相应的资讯隐藏方案. 每种我们提出的方法都会与一些其他现存方法比较,用以证明我们所提方法的优越性。
对于机密资讯传输的主题,我们首先提出了一种整合资讯隐藏和图像压缩的方法。在压缩和资讯隐藏步骤,利用MBTC来嵌入机密资讯,并同时压缩复杂的区块。对于平滑的区块,根据当前欲嵌入的机密资讯,图像修复或BSOC技术将被用于机密资讯嵌入和压缩。为了提高压缩效果与资讯藏量,我们接着结合更丰富的图像压缩技术提出了一个可回复式的资讯隐藏方法。主要运用于将大量的机密资讯隐藏于经过向量量化 (VQ) 压缩后的图像。而搜索顺序编码 (SOC) 和状态码本映射器 (SCM) 技术则用于减小输出码流的大小。
对于数位图像保护的主题,我们提出了一个双重的数位浮水印机制用于保护彩色图像。其中,不可见的强韧性浮水印和脆弱性浮水印将被同时藏入图像分别用于版权保护和图像认证。为了版权保护的目的,第一重强韧的浮水印将利用离散小波变换 (DWT) 嵌入于图像的YCbCr色彩空间。另一方面,第二重脆弱的浮水印是利用改进后的LSB方法藏入于RGB色彩空间。强韧和脆弱的浮水印结合的机制,将更加适用于宝贵的数位图像的保护。
Concerns pertaining to the security and confidentiality of the transmitted digital content have become critical over the past decade. Information hiding, which conducts the concealment of information within cover media is a common way that has been used frequently in modern. In order to preserve both secure secret data communication and digital media protection through the open channels, a study of information hiding techniques is presented in this dissertation.
For the subject of information hiding for secret data communication, data hiding and image compression are seamlessly integrated into a single module to provide secure and efficient communications. We first propose a joint data hiding and compression (JDHC) scheme which is based on block truncation coding (MBTC), and search order coding (SOC) technique. To enhance the compression rate and hiding capacity, we further presents a reversible data hiding scheme for vector quantization (VQ)-compressed images. In this scheme, SOC and state-codebook mapping (SCM) technique are employed to reduce the size of the VQ index table and embed a large amount of secret data. For the subject of information hiding for digital image protection, we present a blind dual watermarking mechanism for color images authentication and copyright protection. In this scheme, discrete wavelet transform (DWT) in YCbCr color space and improved LSB replacement in RGB components are presented to embed invisible robust and fragile watermarks, respectively.
The proposed information hiding schemes in this dissertation achieve the objectives of both secure secret data communication and digital media protection. The experimental results and comparisons with related schemes demonstrate that the proposed JDHC schemes achieve outstanding compression rate, visual quality, and hiding capacity for the different test images. On the other hand, the combination of robust and fragile watermarking makes the proposed dual watermarking mechanism suitable for protecting valuable original images in terms of both copyright protection and image authentication.
URI: http://etd.lib.nctu.edu.tw/cdrfb3/record/nctu/#GT070286025
http://hdl.handle.net/11536/139060
显示于类别:Thesis