印章是中華民族最具高藝術價值之物件，從古至今，在政治及商貿往來都被當作憑信工具。科技的進步加速了政府及各級機關(構)的數位化轉型，紙本公函開始並用關防章與QR Code(Quick Response Code)。有學者為了印章的永續發展，透過程式設計將兩者整合成「印章QR Code」，然而其防偽功能仍有加強空間。
本研究提出以印章QR Code作為藏密浮水印的媒體，利用圖像化的顏色深淺變化及印刷四色CMYK(Cyan, Magenta, Yellow, Black)中的M版模擬紅色印泥，再以75 LPI、100 LPI及150 LPI三種網線(Line per inch, LPI)過網，輸出後利用光柵解碼器(Lenticular Lens)解碼，加強防偽功能。
本研究採實驗研究法，利用程式設計數位解碼浮水印，驗證藏密效果，接著實際輸出影像，先以手機讀取QR Code確認連網功能，再利用光柵解碼器觀察浮水印之加密效果，最後複印影像，再次檢視浮水印是否存在。另外，以1200 DPI (Dot per Inch)高解析度掃描輸出和複印影像，各自數位解碼M版，驗證浮水印之效果。
經實驗測試，本研究發現以M版製作的三種網線數浮水印，其中以100 LPI的解密效果最好，150 LPI可作為加強防偽功能。接著，以解密效果最好的影像背景色重製新影像，改善浮水印的分布情況，複印後的影像，成功讓浮水印消失，達到用於分辨文件的防偽功能，高解析度掃描後的細部取樣更證實，以雙培增長的解析度，不影響浮水印的加解密效果，更可和實際輸出後的光柵解碼相呼應。

Stamp with great artistic value in Chinese history, has been used as an identity in political and commercial transactions until today. With the development of technology, the government has accelerated digital transformation at all levels by using stamps and a quick response (QR) code in official documents. For its sustainability, some researchers have integrated the QR code combining in into the stamps via programming but need to improve the anti-counterfeiting function.
This study proposed to use a watermark combined with a QR code in the stamps. The original image was modified and the watermark was created with three different lines per inch (LPI) which were 75 LPI, 100 LPI, and 150 LPI in magenta channel, then decoded by lenticular lens after printing.
According to experimental research, all functions have been checked in different steps including the watermark effect confirmed by a program before printing. QR code was obtained by the smartphone QR code reader and then decryption was carried out by a lenticular lens before and after photocopying.
Additionally, these original images and their copies were scanned at a high resolution of 1200 dots per inch (DPI) and the watermark in magenta channel was digitally decoded to examine the stability of the watermark. Through these experimental tests, the watermark decryption effect at 100 LPI was the best, and 150 LPI could be used to enhance the anti-counterfeiting function.
With these results, we analyzed the original image background color which had a better decryption effect on improving the watermark detection. With high resolution scanning of the digitally decoded image, one could distinguish and examine the authenticity of the watermark.

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臺灣師範大學(2019)。專利編號I671683。臺北市：經濟部智慧財產局