利用不同間距線網嵌入浮水印之研究
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Date
2015
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Abstract
現今電腦科技的蓬勃發展，使影像複製設備越來越精密，但也導致犯罪者利用影像複製快速之便利，引發出智慧財產權受到威脅等問題。所以本研究之目的為利用不同間距線網嵌入浮水印以保護版權，達到防偽效果。本研究以數位半色調概念建立不同間距線網藏入資訊，採用數位過網演算法形成線網機制，達到數位浮水印效果，調整不同間距，從1~6-pixel間不同組合線網設計測試其加密隱藏效果，另以Human visual system(HVS)進行評估，並透過柱狀透鏡、複印及手機等多重驗證方式進行解密，並加值應用在複習參考書上。
With the rapid growth of information technology, more and more sophisticated machines for image duplication are created to enable image reproduction in an efficient and convenient way. However, it raises a serious threat on intellectual property right. The purpose of this study is to compose digital watermarks with varied line spaces by digital halftoning in an effort to protect copyright and ensure anti-counterfeiting security. To design the line screen watermarks, we finetune varied line spaces between 1 to 6-pixel, and the Human visual system (HVS) is used to evaluate the hiding effect. Then the decrypt can be carried out by lenticular lens, copy machine and smart phone, ultimately leading to the strengthening of anti-counterfeiting mechanism of security documents. The results show that using varied line spaces screen to encrypt messages in documents can provide useful anti-counterfeiting features. The proposed method can be used to develop value-added products.
With the rapid growth of information technology, more and more sophisticated machines for image duplication are created to enable image reproduction in an efficient and convenient way. However, it raises a serious threat on intellectual property right. The purpose of this study is to compose digital watermarks with varied line spaces by digital halftoning in an effort to protect copyright and ensure anti-counterfeiting security. To design the line screen watermarks, we finetune varied line spaces between 1 to 6-pixel, and the Human visual system (HVS) is used to evaluate the hiding effect. Then the decrypt can be carried out by lenticular lens, copy machine and smart phone, ultimately leading to the strengthening of anti-counterfeiting mechanism of security documents. The results show that using varied line spaces screen to encrypt messages in documents can provide useful anti-counterfeiting features. The proposed method can be used to develop value-added products.
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半色調, 數位浮水印, 柱狀透鏡, 線網, halftoning, digital watermark, lenticular lens, line screen