一種基於YCbCr色彩空間之彩色影像浮水印演算法

Color Image Watermarking Algorithm Based On YCbCr Color Space

劉政宏

指導教授 ： 莊謙本

國立臺灣師範大學/科技學院/應用電子科技學系/碩士(2012年)

摘要

本論文提出一種基於YCbCr色彩空間之彩色數位浮水印影像演算法，目的在有效防止浮水印遭受各種攻擊的破壞，並保持浮水印的透明度。為了加強浮水印的強韌度，本研究整合了離散小波轉換、離散餘弦轉換以及雜訊可見函式等技術；同時為了增加浮水印的透明度，將浮水印嵌入中高頻位置，使得浮水印在客觀的數據或主觀的判定上皆有良好的效果。本演算法所加密的浮水印經過壓縮、模糊、銳化、亮度等攻擊，皆仍具有良好的透明度與強韌度，使彩色數位影像的智慧財產權得到更多的保護。

關鍵字

浮水印 ； 透明度 ； 強韌度 ； 離散小波轉換 ； 雜訊可見函式

並列摘要

In this paper, we proposed an algorithm to improve the robustness and transparency for color image watermarking with YCbCr color space. In order to improve the robustness, we integrate Discrete Wavelet Transform (DWT), Discrete Cosine Transform (DCT) and Noise Visibility Function (NVF). Besides, the transparency of watermark was improved by embedding the watermark in the mid-high frequency range. Several watermarked color images with the proposed algorithm were tested against the attacks of compression, blur, sharpen and brightness. The experimental results show that the proposed algorithm of encryption for color image watermark is available for protecting the intellectual property of color image.

並列關鍵字

watermark ； transparency ； robustness ； Discrete Wavelet Transform ； Noise Visibility Function

參考文獻

[2] IEEE Xplore Digital Library(2012). [Online]. Availible at http://ieeexplore.ieee.org/Xplore/guesthome.jsp

[3] M. D. Swanson, M. Kobayashi, and A. H. Tewfik, “Multimedia data-embedding and watermarking technologies,” Proceedings of the IEEE, 1998, Vol. 86, No. 6, pp. 1064–1087.

[4] Chang-Hsing Lee; Yeuan-Kuen Lee；“An adaptive digital image watermarking technique for copyright protection” Consumer Electronics, IEEE Transactions on, Volume: 45 , Issue: 4 , Nov 1999 , Page(s):1005 – 1015.

[7] Zhang, X., Wang, S.: Fragile Watermarking with Error-Free Restoration Capability. IEEE Transactions on Multimedia 10(8), 1490-1499 (2008).

[8] J. Fridrich, M. Goljan, Images With Self-correcting Capabilities, Proceedings of IEEE International Conference on Image Processing, 1999: 792–796.