紅外線浮水印嵌入個人化郵票之研究 Personalized Stamps with Infrared Watermark

Date
2010
Authors
呂章誠
Chang-Cheng Lu
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Abstract
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。
In the recent years, because digital copiers improved rapidly, there are more and more unauthorized counterfeit and copy. Security document sometimes use watermark to improve its effective in protecting documents. Personalized Stamps is a valuable papers that people can participate the stamp design. The objective of this paper is to embed infrared watermark in the personalized stamp. The infrared watermark is composed of cyan, magenta, yellow, and black halftone dots. The carbon material in black ink can absorb the infrared light and the watermark could be detected under infrared detection. A calibration chart is designed to obtain the best parameters to hide the watermark in the personalized stamp. In addition, this research combine the method of dot shift used to hide figurative pattern. The result shows that the infrared watermark could be successfully hidden in a personalized stamp. This method would provide the stamp with not only encoded data but also the aesthetic appearance.
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Keywords
數位半色調, 資訊隱藏, 紅外線浮水印, 網點位移, 個人化郵票, Digital Halftoning, Data Hiding, Infrared Watermark, Dot Shifting, Personalized Stamps
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