植基於尺度不變特徵轉換之強韌型浮水印技術之研究

The Study on SIFT-Based Robust Watermarking Technology

王憶萍(Yi-ping Wang)

指導教授 ： 洪國龍

朝陽科技大學/資訊學院/資訊管理系/碩士(2010年)

摘要

本論文提出一個以特徵點為基礎的強韌型浮水印方法，其方法使用SIFT技術在原始影像中尋找特徵點，再根據特徵點所形成的局部特徵區域(Local Feature Region, LFR)做影像正規化成一個固定大小和方向的正規化影像(Normalized Image)，最後再對Normalized Image進行浮水印的嵌入和偵測。本篇提出的方法，不僅可抵抗全域變形，還可抵抗區域變形，根據實驗數據顯示，本方法優於Lu學者的方法。在本方法中，是利用統計的方式驗證浮水印的存在性，所以不需使用原始影像，因此，我們提出一個有效的浮水印方法。

關鍵字

尺度不變特徵轉換 ； 局部特徵區域 ； 影像正規化

並列摘要

This paper presents a feature-based robust watermarking scheme. The proposed method is to discover the feature from original image against SIFT technique and then proceed with image normalization based on local feature region (LFR) to create one normalized image with fixative size and direction. Afterwards, proceed with the embedding and detection process toward the normalized image. In this proposed method, it can counteract not only the global transformation but local transformation. According to the experimental data, the proposed method is better than Lu’s method; furthermore, the existence of watermark can also be verified by only using the statistic method without any requirement of original image. Therefore, our proposed method is an efficient and effective watermarking method.

並列關鍵字

Normalized Image ； Scale Invariant Feature Transform ； Local Feature Region

參考文獻

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