使用YUV影像之彩色數位浮水印的探討

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Title:	使用YUV影像之彩色數位浮水印的探討 The Study of Color Digital Watermarking Using YUV Image
Authors:	吳明芳王鴻彬詹慧珊
Keywords:	數位影像彩色浮水印頻率域離散餘弦轉換 Digital image Color watermarking Frequency domain Discrete cosine transformation
Date:	2004-12
Issue Date:	2009-08-14 23:40:17 (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彩色影像的完整性以及建構更強健性(Robust)的彩色數位浮水印技術為世所趨。本研究以能強健性藏匿彩色浮水印為目的，將以空間域和頻率域的觀念及探討為出發點，並配合YUV色彩系統，利用離散餘弦轉換將彩色影像由空間域轉換至頻率域，再將彩色浮水印頻域係數經適當處理後藏入媒體彩色影像之中低頻的部分。使其藏入後之彩色浮水印能抵抗各類型影像處理的破壞。在完成理論的探討及推演後，本研究最後以實作來驗證其實際功效。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 proposal is to develop a frequency-domain-based watermarking method in which the color watermarks can be treated. In the proposed method, the YUV color system is first combined with the discrete cosine transformation, and then the color images in the time domain are transformed 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. Finally, a series of experiments will be conducted to verify the practical efficacy of our purpose.
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