資訊科技發展至今，網際網路（Internet）已成為絕佳的資訊交流媒介。許多的個人著作及資訊也因為數位化而能夠在網路上流通，但是，也因此而容易遭受到非法的複製、盜用和散佈而衍生出智慧財產權的問題，數位浮水印便是用來解決此一問題的有效技術之一。數位浮水印的技術發展至今已經多年的歷史了，而許多的文獻在數位浮水印的強健性上也有所探討。而這些相關技術的提出，其目的都是為了使數位資料可以獲得更好的保護。
因此，本論文將分別以兩篇有關空間域與頻率域的數位浮水印技術的強健性做一個探討與研究。首先，以離散餘弦與最小位元取代編碼法（LSB）為基礎的浮水印來探討。接著，以MATLAB做為實驗的平台並且將這些浮水的演算法一一實現。最後，再將獲得的實驗數據以尖峰訊噪比及正規化關聯值等做評估的標準並且加以分析與比較。

The prevailing usage of networks and the huge amount of multimedia data have incurred urgent issues on copyright protection. Digital watermarking techniques have high potential in providing an efficient way to solve this problem. Various watermarking algorithm has been developed in recent years, and it can efficiently identify media ownership, and media legitimate user information.
In this thesis Least Significant Bit (LSB) based spatial domain technique and Middle band Discrete Cosine Transform (DCT) domain techniques are compared. Both subjective (visual effects) and objective (PSNR) method were used to evaluate the watermarked images when different attacks. The middle band DCT domain algorithm is more robust compared to LSB based technique.

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