由於數位化資料的易於複製與傳遞，使得著作權保護已成為一項重要的議題，而數位浮水印即是一種保護數位資料著作權的一種方法。本研究提出一套強韌型數位浮水印機制，並將浮水印藏在不變小波域中，在證明浮水印的著作權時，不需要原圖便可將嵌入影像中的浮水印取出，以證明其著作。由於浮水印的嵌入於不變小波域中，使得本研究的方法可抵抗九十度倍數的旋轉攻擊。本研究模擬了數種攻擊，如JPEG壓縮、雜訊等等，實驗結果顯示，本研究方法同時具有不可察覺性與強韌性。
Copyright protection of digital data becomes more and more important due to the ease of reproduction and transmission. Digital watermarking is a technique to protecting copyright of digital data. In this paper, we proposed a digital image watermarking scheme based on invariant wavelet domain. A watermark image is embedded into a host image via modular operations and can be extracted without resorting to the original image. Experiment results show that our scheme is robust enough to be against attacks, such as multiples of 90° rotation, jpeg compression, adding noise, blurring, and sharpening.
