運用灰色平衡替換於紅外線浮水印之研究

A Study of Infrared Watermarking Using Gray Balance Replacement

本研究目的是設計具有防偽功能之數位創作內容，運用數位加密之方式設計原稿，於一般環境下觀看到可見光作用下的彩色宣傳海報圖像，而在紅外線偵測設備下，將會顯現出隱藏在海報中的編號、作品資料及浮水印圖案，藉由四色印刷顏料青色（Cyan）、洋紅色（Magenta）、黃色（Yellow）及黑色（Black）對於不同光線下的光學特性差異，所呈現出來之浮水印效果將會有差異性，透過可見光範圍外之偵測設備，將隱藏在海報中之浮水印內容做解讀。研究結果顯示此種紅外線浮水印，在具解讀功能之設備下觀看海報時，能夠清楚辨識浮水印，成功呈現隱藏內容，並且在無設備輔助情況下，使人眼難以分辨其中隱藏之浮水印。本研究製作之數位創作內容，除了能夠建立難以模仿之海報作品，增加附加價值與收藏特性，也提供新的作品展示方法之可能性。

The purpose of this research is to design digital creation content with anti-counterfeiting function, use digital encryption to design originals, and see the color poster image under the action of visible light under normal environment, and under the infrared detection equipment, it will appear hidden The number, work information and watermark pattern in the poster are presented by the difference in optical characteristics of the fourcolor printing pigments Cyan, Magenta, Yellow and Black under different light conditions. The effect of the watermark will be different. Through the detection equipment outside the visible light range, the content of the watermark hidden in the poster will be interpreted. The research results show that this kind of infrared watermark can clearly identify the watermark and successfully present the hidden content when the poster is viewed under the equipment with interpretation function, and it is difficult for human eyes to distinguish the hidden watermark without the aid of equipment. The digital creation content produced in this study can not only create poster works that are difficult to imitate, but also increase the added value and collection characteristics, and also provide the possibility of new ways of displaying works.