利用秘密分享與小波轉換之氣象衛星影像著作權保護機制

A Copyright Protection Scheme for Weather Satellite Image Using Secret Sharing and Wavelet Transform

蔡依儒(I-Ju Tsai)

指導教授 ： 謝尚琳

大同大學/電機資訊學院/資訊工程學系所/碩士(2006年)

摘要

本篇論文使用氣象衛星影像作為保護的影像，且根據影像特性提出一種新的著作版權保護機制。論文所提出的方法首先會從氣象衛星影像中抽取出雲的影像，再將原本的影像和雲的影像組合成一張新的影像，以便抽取特徵。接著，新的影像將被分成許多沒有重疊的區塊，並將每個區塊做離散小波轉換。最後再使用秘密分享的機制來保護這張氣象衛星影像的著作權。
這個機制並不會嵌入任何資料到要保護的影像，所以不會影響到影像品質。此外，實驗結果顯示這個機制是強健的，而且可以抵抗一些基本的影像處理攻擊，像是JPEG壓縮、模糊化、銳利化、縮小、剪裁、加入雜點以及調整亮度或對比的操作。

關鍵字

數位浮水印 ； 離散小波轉換 ； 秘密分享

並列摘要

This thesis takes weather satellite images as the host images and proposes a novel copyright protection scheme according to the properties of the images. First, the cloud image is extracted from the weather satellite image and then combined with the original satellite image to generate a new image for features extraction. Next, the scheme divides the new image into non-overlapping blocks and classifies the blocks according to the coefficients of the wavelet domain. Finally, the scheme uses the secret sharing scheme to protect the copyright of the weather satellite image.
The scheme does not embed a watermark to the host image. Therefore it does not decrease the image quality. Moreover, the experimental results show that the proposed scheme is robust and can resist basic image-processing attacks such as JPEG compression, blurring, sharpening, scaling, cropping, noise adding, brightness adjustment, and contrast adjustment.

並列關鍵字

discrete wavelet transform. secret sharing ； digital watermark

參考文獻

[1]Shang-Lin Hsieh and Bin-Yuan Huang, "A Copyright Protection Scheme for Gray-Level Images Based on Image Secret Sharing and Wavelet Transformation," Proceedings of International Computer Symposium, pp. 661-666, 2004.

[2]Shang-Lin Hsieh, Hsuan-Chieh Huang, and I-Ju Tsai, "A Copyright Protection Scheme for Gray-Level Images Using Human Fingerprint Images as Watermarks," Proceedings of International Conference on Information Technology: New Generations, pp. 482-489, Apr. 2006.

[3]Chin-Chen Chang, Ju-Yuan Hsiao and Chi-Lung Chiang, "An Image Copyright Protection Scheme Based on Torus Automorphism," Proceedings of the First International Symposium on Cyber Worlds, pp. 217-224, Nov. 2002.

[5]Wen-Hsiang Tsai and Yen-Chung Chiu, "A Study on Digital Watermarking and Authentication of Images for Copyright Protection and Tampering Detection," Master Thesis, National Chiao Tung University, June 2004.

[6]Hung-Hsu Tsai, Kuo-Chun Wang, Yi-Chun Kao, and Hou-Chiang Tseng, "Classification-based Image Watermarking Using Rank Order in the Wavelet Domain," Proceedings of National Computer Symposium, 2005.