标题: 利用3D KINECT影像做视讯监控应用上之隐私保护与秘密隐藏
Privacy Protection and Secret Hiding via 3D KINECT Images for Video Surveillance Applications
作者: 曾颂贤
Tsang, Chung-Yin
蔡文祥
Tsai, Wen-Hsiang
多媒体工程研究所
关键字: 资讯隐藏;深度资讯;加速稳健特征;data hiding;depth information;speeded up robust features
公开日期: 2013
摘要: 随着立体电脑视觉技术的快速发展,3D影像设备越来越普及,可在各种条件下读取3D多媒体资讯。微软的KINECT设备即是一着名的例子,它不仅可以捕捉彩色影像,更可以捕捉深度资讯,让各种应用中的3D资讯撷取变得更为方便。
本研究提出了三种方法来达到在3D视讯监控中保护隐私及进行3D影像伪装的目的。第一种方法可在3D视讯监控中保护使用者所选择的隐私区域。该法利用可逆的映射函式,将隐私区域的影像转变为与背景影像相似的伪装影像,藉以产生一受保护视讯。第二种方法将该法延伸,做到隐藏私密性动态活动的作用,并藉由加速稳健特征(speeded up robust features, SURF)和匹配演算法(matching algorithm)来自动侦测动态区域,作为私密影像的部分。第三种方法运用可逆的对比映射(reversible contrast mapping, RCM)方法来伪装3D影像,可以将指定的3D秘密影像转变成3D伪装影像,并可无失真地恢复原来3D秘密影像的本貌。根据RCM的方法可以把3D秘密影像隐藏在3D伪装影像中,藉以产生资讯隐藏的效果。
本论文所提出的方法皆获得良好的实验结果,证明其在实际应用上可行。
With the rapid development of stereo-vision technology, 3D imaging devices become more and more popular. Many types of such devices have been invented to acquire 3D multimedia information under various conditions. One famous example is the KINECT device manufactured by Microsoft. It can capture not only color images but also depth images, making it easier to get 3D information for uses in various applications. In this study, we propose three methods for video surveillance applications with the aims of privacy protection in 3D video surveillance as well as 3D image steganography.
The first method is proposed for protecting a user-selected privacy-sensitive region in a 3D surveillance video, in which reversible prediction-based mappings are used to convert the privacy-sensitive region in each image frame into a background image part, resulting in a protected video. The method is extended further to conceal private motion activities in surveillance videos, by which motion regions are detected automatically as privacy-sensitive image parts by the SURF extraction and matching algorithm. The reversible mapping scheme used in the two methods guarantees lossless retrieval of the concealed privacy-sensitive image part from each image frame in the protected video.
Moreover, a method using the reversible contrast mapping (RCM) scheme for 3D image steganography is proposed, which can hide 3D secret images into 3D cover images, as well as recover the embedded 3D secret image losslessly. Specifically, the method hides 3D secret images into non-object holes in the 3D cover image according to the RCM scheme to yield a 3D stego-image which has a steganographic effect. Also embedded into the input 3D cover image is a recovery sequence which can be extracted from the 3D stego-image to retrieve the original 3D secret image.
Good experimental results are also presented to show the feasibility of the proposed methods for real applications.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT070056631
http://hdl.handle.net/11536/72472
显示于类别:Thesis


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