【作者】 苟文海；

【导师】 袁晓辉；

【作者基本信息】 东南大学 ， 模式识别与智能系统， 2005， 硕士

【摘要】 近几年来,信息隐藏技术在各个应用领域发挥者越来越重要的作用。越来越多的数字音频、视频、和图像开始使用独特的、不可见的标记来隐藏版权信息或序列号,以帮助发行者直接保护其产品的版权不受侵犯。在军事通信中也使用了越来越多的隐蔽通信技术,这些技术不仅仅是使用加密技术来隐藏信息的内容,它们更多的是寻求各种技术来隐藏信息的发送方,接收方的信息以及它们的存在性。这些都使得信息隐藏技术飞速发展。我们选择隐蔽通信作为我们研究信息隐藏技术的领域,我们根据该领域的研究侧重点和信息隐藏技术可行性分析,把数据加密技术和隐藏技术结合起来,将保证信息的安全性和载体图像的视觉透明性作为研究重点。文中首先回顾了数据加密技术的发展历史和当前比较有代表性的几个典型加密算法,并把它们应用到图像加密领域中,接着又分析和介绍了信息隐藏技术的发展历史和现状,并简单介绍了在每一领域中的侧重点和典型隐藏算法,然后讨论了空间域和频率域人眼视觉模型,将人眼视觉特性与图像的特征结合起来,对模型进行了改进与简化,从而我们根据人眼视觉模型得出的数据提出了一些利用人眼视觉模型的图像隐藏算法,并在DCT算法中引入了密码学的概念,即密码嵌入和密码提取。在DWT算法中引入了多尺度、多余度的隐藏,提高了抵抗攻击的鲁棒性。对不同参数变换条件下对图像嵌入和提取的影响程度进行了定量分析。除此之外,我们还考虑了图像载体容量问题并给出了估计方法,这为信息嵌入前选择合适的载体提供了一个定量的依据。最后,我们用软件实现了信息加密与隐藏技术,并在文中给出了该软件的流程和框架结构。更多还原

【Abstract】 Information hiding techniques have recently become important in a number of application areas .Digital audio ,video ,and images are increasingly furnished with distinguishing but imperceptible marks, which many contain a hidden copyright notice or serial number or even help to prevent unauthorized copying directly .Military communications systems make increasing use of traffic security techniques which ,rather than merely concealing the content of a message using encryption ,seek to conceal its sender ,its receiver ,or its very existence .These accelerate the development of information hiding technology .We select the convert communication as our research field and focus our research on the image transparence in the vision based on the convert communication and information hiding technology feasibility .We firstly give an overview of the field and some typical data encryption algorithm .and apply to images encryption domain .secondly Analyze and introduced the information hiding technical development history and present conditions again immediately after, and introduced part in brief in each realm of lay particular emphasized on and several classical algorithm .Afterwards we discuss the human vision system (HVS )in space domain and frequency domain respectively ;We provide some algorithms to embed the information using the HVS models ,analyzing the algorithm flow and correctness of the extracted data .and the encryption concept is led to DCT domain algorithm ,which the password will be used in imbeds to withdraw from the carrier .and the Multi-dimension ,Multi-redundancy is led to DWT domain algorithm ,increasing the robustness . To under the different parameter transformation condition we carried on the quantitative analysis to the influence of image imbed and withdraw .Besides that we think over the carrier capacity and give some estimating methods ,which gives a quantitative basis to select appropriate carrier to embed the information .At last we implement the technology in a software ,and in the thesis we give a software frame to explain how to implement the data-encryption and the data-hiding technique in software .更多还原