紅外線浮水印於合成皮革之加值應用

Abstract

由於文化創意產業及環保意識的崛起，現今多數的皮製產品不再以真皮為主要素材，並大量使用合成之皮製物，以滿足顧客多樣化、客製化的需求；另一方面，由於仿冒商品亦為全球所關心之議題，因此以合成皮所製作之產品亦須具備相當程度之防偽功能。本研究目的在以半色調技術設計之浮水印隱藏於人工皮革產品中，並利用紅外線偵測驗證浮水印之存在。透過UV平台式噴印機，列印防偽機制於合成皮革之文創商品，並使用數位半色調和印墨材料在紅外線照射下的光學特性差異，構成具防偽功能的浮水印。藉由紅外線偵測裝置進行觀察檢視隱藏有資訊的浮水印，以驗證加密效果。另藉由測試導表了解UV印墨之噴印特性後，找出黑（K）、洋紅（M）、青（C）、黃（Y）印墨比例的最適組合，將隱藏圖案設計成浮水印的形式整合於合成皮革所製作之文創商品的加密圖像中。結果顯示，所輸出製作之防偽浮水印，可利用紅外線偵測裝置成功辨識所隱藏之圖像，並且進行加值應用於合成皮革產品中。

The rise of cultural creative industry and environmental awareness has led to the phenomenon that most of leather products are no longer made of genuine leather. Products made of synthetic leather are manufactured in massive quantity to satisfy the diversified and customized needs. On the other hand, anti-counterfeiting features are required for products of synthetic leather, because unauthorized duplication is an issue of global concern. The study is focused on a hidden watermark designed by digital halftoning techniques. Infrared detection is used to verify the existence of the watermark. A counterfeiting mechanism involving UV inkjet printer is introduced in cultural creative products made of synthetic leather. The difference in the optical properties of ink materials is explored to produce a watermark with multiple anti-counterfeiting features. It allows observation of watermark with hidden information under IR detection for verification. A calibration chart is used to find the optimized density combination of inks of black（K）, magenta（M）, cyan（C） and yellow（Y）. The hidden pattern is designed into a watermark and integrated in an encrypted image on a cultural creative product made of synthetic leather. The results show that the hidden watermark can be successfully identified by using IR detection device.