三維數(shù)字產品認證系統(tǒng)的設計與實現(xiàn)

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摘要 具有數(shù)千年歷史的古老學科圖形學，在現(xiàn)今的計算機時代得到了飛速發(fā)
展。在許多主流的多媒體應用中，如計算機輔助設計，虛擬現(xiàn)實等，三維模型起著重要的作用。如何控制和管理這些三維模型是一個亟待解決的現(xiàn)實問題。
數(shù)字水印，一項源于隱寫術的信息隱藏技術，很好地解決了使用需求和內容控制之間的矛盾。其通過將一個不可見的標記嵌入到多媒體作品中，能夠抵御有意和無意的攻擊，以達到內容認證，版權保護等目的。然而，相對于圖像，視頻和音頻領域的水印技術，三維模型水印技術，尤其是其中的魯棒水印和盲水印，顯得很不成熟。
文中使用的水印嵌入算法是基于矢量長度的三維模型共有水印算法，對一般的攻擊都具有較好的魯棒性。使用的二值水印由外部印章轉換得出，借用傳統(tǒng)的二值圖像轉換方法，選取中間閾值作為比較對象，逐點像素進行轉換，并保存轉換得到的二值水印信息。在水印提取前，需要做一些預處理工作：重定位、重采樣。提取水印之后的認證工作是由二值序列到圖像的轉換，然后再從圖像的角度進行相似比較的算法設計進行。最后給出了對評估算法的難點和發(fā)展前景進行了總結和展望。

關鍵詞 版權保護 數(shù)字水印 圖像轉換


Design and Implementation of a three-Dimensional Digital Product Certification System

Abstract Graphics, as an ancient science stemming from thousands of years ago, has been flourishing in current computer era. Besides, 3D models are playing an important role in many mainstream multimedia applications, such as CAD and virtual reality. How to control and manage these models becomes a practical and urgent problem.
Digital watermarking, an information hiding technique deriving from steganograph, perfectly balances the needs of product users and the rights of content owners. It embeds an invisible mark into multimedia products for special purposes, including content authentication, copyright protection, and so on, which can withstands intentional or unintentional attacks. However, while watermarking of image, video and audio is reaching maturity nowadays, 3D watermarking is still in it infancy, especially its blind and robust branch. At present, being the most general and flexible 3D modeling scheme to represent complex surface model, triangular mesh draws primary attention within 3D watermarking research.
Watermarking algorithm used in the text is based on the total length of the three-dimensional model of the vector watermarking algorithm, attacks have generally robust. Binary watermark is derived from the use of an external seal conversion, to borrow a traditional binary image conversion method selected intermediate threshold as a comparison, the pixel-by-point conversion, and save the binary watermark information conversion. Before watermark extraction, need to do some preprocessing: Relocation, resampling. After certification watermark is a binary sequence to image conversion, and then from the perspective of the image similarity comparison algorithm design. Finally, the difficulties and prospects for eva luation algorithm summarized and outlook.

Key Words copyright protection digital watermarking image conversion


目錄
第一章 緒論......................................................1
1.1課題研究背景及意義 1
1.2 國內外相關技術發(fā)展現(xiàn)狀 2
1.3本文的工作安排 5
第二章 三維模型數(shù)字水印技術....................................6
2.1 數(shù)字水印技術的本質與特性 6
2.2數(shù)字水印的基本框架 7
2.3 三維模型數(shù)字水印的特性與分類 8
2.4三維模型數(shù)字水印技術概述 10
2.4.1 三維模型的表示方法 10
2.4.2三維網格模型數(shù)字水印技術特點與要求 12
2.4.3三維網格模型數(shù)字水印算法研究進展 14
2.4.4三維模型數(shù)字水印的攻擊問題 19
2.5三維模型數(shù)字水印的性能評價 20
第三章 三維水印的嵌入與提取方法............................22
3.1 理論基礎 22
3.1.1 法向量數(shù)字水印模型 22
3.1.2 水印攻擊與提取算法 23
3.1.3 水印的檢測與比較 24
3.2 三維水印嵌入算法 25
3.3 三維水印提取算法 26
第四章 三維數(shù)字產品認證系統(tǒng)實現(xiàn)...............................29
4.1系統(tǒng)介紹 29
4.2 圖像至二值水印信息的轉換 30
4.3 水印嵌入 32
4.3.1 水印嵌入程序設計 32
4.3.2 水印嵌入運行界面 36
4.4 水印提取及相似圖像比較 37
4.4.1 水印提取程序設計 37
4.4.2 水印提取與比較運行界面 39
結論..............................................................40
致謝..............................................................41
參考文獻..........................................................42