隨著因特網的發展，數字水印技術被廣泛的應用于數字圖像，音頻，視頻等多媒體產
品的版權保護。該文提出了一種有效的數字水印算法。首先利用混沌映射將水印進行預處理，保證水印的安全性，然后，原始圖像按水印的比特位分成若干個大小相等的子塊，利用奇異值分解來分解每個子塊，將水印比特嵌入到子塊的最大奇異值處，最后，利用反變換得到嵌入水印的圖像。實驗表明，本方法保證了水印信息的安全性，有較好的不可見性和魯棒性。
關鍵詞：數字水印；混沌映射；奇異值分解；
Abstract: With the development of the Internet, Watermarking technology has been widely used in digital image, video, audio, and other multimedia fields. In this paper, a new method of effective digital image watermark is put forward. First of all, chaos mapping technology is used to treat the watermark to protect the security of the watermark, then, the original image is divided by bytes of the watermark with the help of the SVD, and embed the watermark byte to the largest singular value. Last, the image embedded watermark is finished by the anti-transform of SVD. The results of the experiment indicate that the method can assure the security of the watermark, and the destination image has good invisibility and robustness.
Key words: watermarking; chaos mapping; SVD;