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博碩士論文 etd-0621104-152526 詳細資訊
Title page for etd-0621104-152526
論文名稱
Title
基於多維度直方圖可抗幾何及信號處理之浮水印技術
Multi-dimensional Histogram-based Watermarking Scheme for Resisting Geometric and Signal Processing Attacks
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
52
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2004-06-11
繳交日期
Date of Submission
2004-06-21
關鍵字
Keywords
幾何、浮水印
Geometric, Watermarking
統計
Statistics
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中文摘要
近來,由於多媒體資料散佈的快速成長,有許多保護著作權的數位浮水印方案被提出。強軔性是浮水印其中的要點之一。但是,大多數傳統的浮水印方法,通常無法有效的同時抵抗幾何扭曲跟信號處理的攻擊。
要抵擋幾何攻擊可分為兩種不同的解決方式:非盲目與盲目的方法。在非盲目的研究中由於原始影像是已知的, 可藉由比對遭受攻擊的圖與原始影像來穫得良好的解決方案。而對於盲目的方法來說,由於無法使用原圖來做浮水印粹取的動作,明顯的將更具有挑戰性。
在這篇研究當中,我們題出了一個基於長條分佈圖特性且不須原圖就能粹取浮水印的方法。也就是我們提出一個新的方案,定義原始影像彩色空間的晶狀結構來藏匿浮水印的資料。我們藉由計算影像不同特性的長條分佈圖,並將其分佈圖等份切割為眾多動態區間。致使每個區間的內含相同數量的像素。然後,透過調整區間中各個像素的分佈來達到藏匿浮水印的工作。
由實驗的結果指出,這個方法可以有效的同時抵抗一般的幾何攻擊與大量的JPEG壓縮。
Abstract
Many digital watermarking schemes have been proposed for copyright protection recently due to the rapid growth of multimedia data distribution. Robustness is one of the crucial important issues in watermarking. But, most of traditional digital watermarking schemes is normally not to resist both geometric distortion and signal processing attacks well.
There are two different types of solutions to resisting geometrical attacks: nonblind and blind methods. With the noblind approach, due to availability of the original image, the problem can be resolved with a good solution by elective search between the geometrically attacked and unattacked image. The blind solution, which does not use the original image in watermark extraction, is obviously more challenging.
In this research, we propose a blind watermarking scheme which based on histogram property. So that, we propose a novel scheme to define the lattice structure of color space of host image for embedding watermark data. We utilize the histograms of various properties that calculated from the host image, and partition each histogram space into several divisions with dynamic interval. The number of pixels of each division is equal. And then we embed watermark data by modifying distribution of each division.
The experimented results present the algorithm is robust to resist common geometric attacks and high quality JPEG compression at the same time.
目次 Table of Contents
Chapter 1 Introduction…………………………………………………...1
1-1 Background……………………………………………………………...…1
1-2 Motives and Objectives…………………………………………………….4
Chapter 2 Relevant Literature Discussion……………………….5
2-1 Invariant Domain Watermarking Scheme…………………………...……..5
2-1-1
參考文獻 References
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