基於視覺機密分享與BCH碼之版權保護機制

Copyright Protection Scheme Based on Visual Secret Sharing and BCH Code

10.29688/MHJ.201208.0011

趙和昌(Her-Chang Chao)；范佐搖(Tzuo-Yau Fan)

浮水印 ； 版權保護 ； 離散小波轉換 ； 視覺機密分享機制 ； Watermarking ； copyright protection ； discrete wavelet transform ； visual secret sharing

明新學報

38卷2期（2012 / 08 / 01）

157 - 167

繁體中文

本論文提出基於視覺機密分享與BCH碼之版權保護機制。此方法包含兩階段。第一階段為產生所有權影像，第二階段則為取回浮水印階段。在產生所有權影像階段裡，將欲註冊影像經由n階層離散小波轉換取得影像的特徵，以此特徵產生特徵影像；並藉由BCH碼將浮水印編碼為驗證碼，運用特徵影像、驗證碼和視覺機密分享機制（Visual Secret Sharing Scheme, VSSS）可實現所有權影像。在浮水印取回階段，特徵影像由欲驗證影像中生成，並透過特徵影像與所有權影像疊合而取回驗證碼，經BCH碼解碼出驗證影像所有權之浮水印。此方法在產生影像所有權驗證碼時不僅不需要修改原圖，並且BCH碼可提升浮水印的強韌性。從實驗結果得知，本機制可抵抗多數的影像處理攻擊。

In this paper, a copyright protection scheme based on visual secret sharing and BCH code is proposed. The scheme includes ownership image construction and watermark extraction. In the ownership image construction, the characteristic of image is then extracted by n-DWT decomposing from the host image, the characteristic of image can be created the feature image. Next, a verification code is generated by BCH code from a watermark. An ownership share can be generated according to the feature image, the verification code, and the visual secret sharing scheme (VSSS). In the watermark extraction, the feature image can be produced from a suspected image. By stacking the feature image and the ownership image, and BCH decode, the hidden watermark, used for copyright verification, can be obtained. The scheme cannot only maintain the quality of a host image, but also can enhance the robustness of the watermarking by BCH code. The experimental results show that the proposed scheme can resist several image processing attacks.

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