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科技與工程學院
圖文傳播學系
學位論文
學位論文
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http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/73898
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search.filters.author.Chang-Cheng Lu
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search.filters.author.呂章誠
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search.filters.subject.Data Hiding
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search.filters.subject.Digital Halftoning
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search.filters.subject.Dot Shifting
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search.filters.subject.Infrared Watermark
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search.filters.subject.Personalized Stamps
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紅外線浮水印嵌入個人化郵票之研究
(
2010
)
呂章誠
;
Chang-Cheng Lu
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圖文複製技術的快速發展,使得非法複製與偽造的氾濫,安全文件常會應用浮水印技術加強其安全性,個人化郵票是使用者可參與設計之有價證券。 本研究應用紅外線浮水印加密技術,將資訊嵌入於個人化郵票中。在紅外光線下,黑墨因為含碳黑物質,會吸收紅外線光,而青、洋紅、黃色墨則在紅外線下呈現透明之光學特性,以數位過網演算製作出不同線數之調幅網點所混合成的中性灰底紋,並將資訊隱藏其中。利用校正導表,以系統性的方式,找出隱藏紅外線浮水印的最佳匹配參數,另結合網點位移概念,隱藏其他資訊。將紅外線浮水印嵌入個人化郵票後,利用紅外線攝影裝置進行偵測並對浮水印解密還原。 實驗結果顯示,利用校正導表找出隱藏紅外線浮水印的最佳匹配參數,並成功製作出有紅外線浮水印之個人化郵票,且對浮水印解密還原,使個人化郵票能有二維條碼功能,且具有一般郵票的外觀,達到兼具美觀與實用性。
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