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Author: 邱鈺嵐
Chiu, Yu-Lan
Thesis Title: 利用不同間距線網嵌入浮水印之研究
Watermarking by using line screen with varied spaces
Advisor: 王希俊
Wang, Hsi-Chun
Degree: 碩士
Master
Department: 圖文傳播學系
Department of Graphic Arts and Communications
Thesis Publication Year: 2015
Academic Year: 104
Language: 中文
Number of pages: 62
Keywords (in Chinese): 半色調數位浮水印柱狀透鏡線網
Keywords (in English): halftoning, digital watermark, lenticular lens, line screen
DOI URL: https://doi.org/10.6345/NTNU202205104
Thesis Type: Academic thesis/ dissertation
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  • 現今電腦科技的蓬勃發展,使影像複製設備越來越精密,但也導致犯罪者利用影像複製快速之便利,引發出智慧財產權受到威脅等問題。所以本研究之目的為利用不同間距線網嵌入浮水印以保護版權,達到防偽效果。本研究以數位半色調概念建立不同間距線網藏入資訊,採用數位過網演算法形成線網機制,達到數位浮水印效果,調整不同間距,從1~6-pixel間不同組合線網設計測試其加密隱藏效果,另以Human visual system(HVS)進行評估,並透過柱狀透鏡、複印及手機等多重驗證方式進行解密,並加值應用在複習參考書上。

    With the rapid growth of information technology, more and more sophisticated machines for image duplication are created to enable image reproduction in an efficient and convenient way. However, it raises a serious threat on intellectual property right. The purpose of this study is to compose digital watermarks with varied line spaces by digital halftoning in an effort to protect copyright and ensure anti-counterfeiting security. To design the line screen watermarks, we finetune varied line spaces between 1 to 6-pixel, and the Human visual system (HVS) is used to evaluate the hiding effect. Then the decrypt can be carried out by lenticular lens, copy machine and smart phone, ultimately leading to the strengthening of anti-counterfeiting mechanism of security documents. The results show that using varied line spaces screen to encrypt messages in documents can provide useful anti-counterfeiting features. The proposed method can be used to develop value-added products.

    目次 摘要 i Abstract ii 目錄 iii 表次 v 圖次 vi 第一章 緒論 1 第一節 研究背景與動機 1 第二節 研究目的 2 第三節 研究問題 3 第四節 研究範圍與限制 3 第五節 研究流程 4 第六節 名詞解釋 5 第二章 文獻探討 6 第一節   數位半色調技術 6 第二節 實體浮水印資訊隱藏技術 14 第三節 柱狀透鏡 24 第四節 文獻探討小結 32 第三章 研究方法與設計 33 第一節 研究架構 33 第二節 研究設備與工具 33 第三節 不同間距線網浮水印設計 34 第四章  研究結果與討論 41 第一節 不同間距線網浮水印實驗結果 41 第二節 透過HVS演算法模擬不同間距加密浮水印的隱藏效果 44 第三節 最佳間距線網加密技術效果評估 48 第四節 隱藏答案複習參考書加值應用 51 第五章  結論與建議 56 第一節 研究結論 56 第二節 研究建議 57 參考文獻 58

    中文部分
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