本論文中，改良了一種基於離散小波轉換的數位影像浮水印，並且應用於Android行動平台上。近兩年來，智慧型手機與平板電腦的廣泛使用，其內置的高解析鏡頭與3G連網的特性，使得大量的個人攝影及插畫創作分享於網路上，而複製數位影像且進一步編輯也是相當容易
地，為了避免非授權者竄改後的所有權歸屬問題，數位影像版權的設置與保護因而有了應用空間。
我們提出的5/3小波轉換式浮水印系統，係改良既有浮水印嵌入影像的演算法，並於驗證端採用參考嵌入資料的方式來萃取浮水印。透過實驗分析，能降低置入浮水印後對母影像品質的損壞，且提高浮水印抵抗攻擊的強健性，於此同時，本演算法可減少運算量、增加對母影
像與浮水印的適應性。另外，結合選取感興趣區域，可更有效益地宣告版權，最後實作成Android應用軟體。

In the paper, we propose a wavelet-tree based digital image watermarking algorithm, and implement it on Android platform
as an application. In the past two years, smartphones and tablets have been used widely. Due to the inner high-pixel
camera and 3G connecting characteristics of them, lots of personal photographs and illustrations are shared on the
internet. Besides, copying digital image and editing it
further are quite easy. Therefore, there is a reason to protect digital ownership from illegal declaration after non
-authorized people tamper the file.
The proposed watermarking improves the embedding method, and offers an effective extraction which is depending on embedding data. According to experimental analysis, the
proposed system could improve image quality, and get a better extracting solution for different type watermarks.
Moreover, the proposed one has lower computation and high
er applicability for image and watermark than the previous
method. Finally, the system combines ROI and is implemented
on Android OS.

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