結合印紋之點矩陣全像片設計及其品牌保護應用之研究

Dot Matrix Hologram with Designed Patterns and the Application to Brand Protection

傅如尉(Ju-Wei Fu)

點矩陣全像片 ； 品牌保護 ； 防偽科技 ； Dot matrix hologram ； Brand protection ； Anti-counterfeiting technology

中華印刷科技年報

2013（2013 / 06 / 01）

3 - 20

繁體中文

由於科技蓬勃發展，偽造情況日益增加，近年來世界各國在發行新版證件與鈔券等安全文件時，均廣泛運用具有抵抗影印及掃描功能之全像科技。然而全像片的光影變化效果必須在點光源及特定角度之下才可清楚顯示。為改善不易觀察情形，本研究設計不同濃度之印紋與點矩陣全像片結合，使其在漫射光源與各種角度觀察時，品牌名稱與字樣依然清晰可見，提升品牌識別程度，讓使用者對品牌印象加深，減少混淆與誤認情形，進而達到品牌保護的效果。本研究以Matlab開發全像影像電腦輔助設計程式之預覽模組，預覽全像片的光影變化效果；接著，分別計算全像片與結合印紋之全像片的數位模擬影像之色彩值與明暗值，並與真實影像比較兩者差異性；同時，以印紋作為遮罩的方式可彰顯全像片內容識別程度，達到品牌保護之防偽效果。研究結果顯示，利用全像影像電腦輔助設計程式之預覽模組，能夠準確預覽全像片與結合印紋之全像片的光影變化效果；此外，全像片與結合印紋之全像片的數位模擬影像之色彩值與明暗值，也確實與真實影像結果相互呼應，而數位模擬及人眼觀察的印紋全像片組合結果之一致性，也與品牌保護概念相互呼應。

With the rapid advance of digital technology, counterfeiters can easilier fabricate unauthorized copy of security document. In view of this situation, more and more countries have added OVD (optically variable device), which can prevent from copying and scanning, into legal documents, passport and banknote. Dot matrix hologram, also a kind of OVD, has played an important role in this trend. However, the iridescent (rainbowlike) feature of hologram can only be clearly observed at specific angles and under pointed light sources. To improve the observing situation, this research aimed to design patterns with different densities and integrated with hologram to enhance the recognition of brand content. With the enhancement of brand content, the users would have less difficulties in confusing and misunderstanding about the brand. To achieve the purpose of brand protecting, this research used Matlab to develop computer assisted program for the design of dot matrix hologram which includes three modules: a) error locating module, b) composition module, and c) preview module. Besides, this research calculated the color values and light values of digital simulated image of hologram and the hologram with designed patterns, then compared these data with the virtual ones. Moreover, integrated hologram with designed patterns as masks can highlight the content of hologram, thus can achieve the idea of brand protection. The results showed that Matlab-based computer assisted program could accurately preview the iridescent (rainbow-like) feature of hologram and thus reduce rate of failure to output a dot matrix hologram. Furthermore, the data of color values and light values of both digital simulated image of hologram and hologram with designed patterns were matched. Therefore, to dig out the best combination of hologram with designed pattern which is suitable for real-world observing circumstances, the future works of this research will output 121 sets of designed patterns to integrate with hologram and record these combinations by photograghing. Compare the outcome of digital simulated image of hologram and hologram with designed patterns, then determine whether they are same or not.

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