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dc.contributor.author姚志憲en_US
dc.contributor.author蔡文祥en_US
dc.date.accessioned2014-12-12T01:44:09Z-
dc.date.available2014-12-12T01:44:09Z-
dc.date.issued2009en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT079757529en_US
dc.identifier.urihttp://hdl.handle.net/11536/46069-
dc.description.abstractWith the convenience of the Internet, information exchanges through the Internet become very frequent nowadays. The JPEG XR image is a new image file format which supports high compression ratios and becomes more and more popular in information communication. In this study, three methods for data hiding applications via JPEG XR images are proposed, including covert communication, image authentication, and copyright protection. For covert communication, a data hiding method via JPEG XR images for use in covert communication is proposed, which encodes selected quantization parameters of highpass frequency bands to embed secret messages. In addition, a technique to generate a stego-image with the original cover image file size being kept for reducing the possibility of arousing notice from attackers is also proposed. For image authentication, a block-based authentication method based on embedding DC_LP coefficients as authentication signals into the highpass coefficients of the image blocks is proposed, which can be employed to verify the integrity and fidelity of JPEG XR images by comparing the extracted authentication signals with those computed from the current image content. For copyright protection, a removable visible watermarking method based on modifying the DC_LP coefficients in JPEG XR images by certain number division operations is proposed. Specifically, the remainders of dividing the DC_LP coefficients by a pre-selected integer number are embedded into the highpass coefficients of image blocks as watermark signals which can be losslessly removed if necessary. Measures to enhance the security of each of the proposed methods are also suggested. Good experimental results show the feasibility of the proposed methods.zh_TW
dc.language.isoen_USen_US
dc.subjectJPEG XRzh_TW
dc.subject資訊隱藏zh_TW
dc.subjectJPEG XRen_US
dc.subjectInformation hidingen_US
dc.title在JPEG XR 影像上做資訊隱藏之新研究zh_TW
dc.titleA New Study on Information Hiding via JPEG XR Imagesen_US
dc.typeThesisen_US
dc.contributor.department多媒體工程研究所zh_TW
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