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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/8810

    Title: 強健性彩色數位浮水印之研究
    其他題名: The Research of Robust Color Watermarking
    Authors: 王鴻彬
    Wang, Horng-Bin
    指導教授: 吳明芳
    Keywords: 彩色浮水印
    color watermarks
    Date: 2003-06-19
    Issue Date: 2010-02-27 21:12:00 (UTC+8)
    Abstract: 近年來數位影像浮水印的藏匿技術廣受熱烈探討。儘管浮水印技術的發展至今已趨完整,所處理的浮水印也由字串及黑白的二位元影像進展到灰階浮水印,但在彩色浮水印的技術部份仍有很大的發展空間,而如何盡量保存原始影像的完整性以及建構更強健性(Robust)的浮水印技術為世所趨。
    The hiding of digital watermarks has been an interesting problem for many researchers in recent years. Although many watermarking techniques were proposed successfully to deal with both bi-level and gray-level watermarks, it is necessary to develop a robust watermarking method for the color watermarks.
    The purpose of this thesis is to develop a frequency-domain-based watermarking method in which the color watermarks can be treated. In the proposed method, the discrete cosine transformation is adopted to transform the color images in the time domain into the frequency domain. After the proper treatment, the frequency coefficients of the color watermarks are hidden into the middle-low-frequency coefficients of the color images. In the hiding process, the robustness of the middle-low- frequency is developed into a favorable property to resist the ravages of various image processing. The discrete cosine transformation is used to develop the hiding of color watermarks, successfully promoting the hiding of frequency domain base from gray-level digital images and watermarks to color-level ones. It can be verified by experiments that, after hiding the color digital watermarks, the color digital images can maintain the same qualities. Furthermore, the color digital ones can be successfully taken back after the ravages of various image processing. This result reveals that the application of digital watermarking techniques is promoted to be more general and practical.
    Appears in Collections:[電機工程系所] 博碩士論文

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