創新數位點矩陣全像片資料隱藏技術

Abstract

本研究目的為提出一個創新的數位點矩陣全像片資料隱藏的方法，利用誤差擴散的數位過網技術和擬似隨機亂數(pseudo random number)的方式決定資料隱藏的位置，在影像區域中隱藏資料並過網產生六種不同的顏色，而編碼的過程利用BCH (Bose-Chadhuri-Hocquenghem)錯誤校正碼(Error Correction Code)針對兩階浮水印影像進行容錯編碼，使嵌入的浮水印資訊具有錯誤校正的能力，而輸出後的全像片以幾何轉換方式針對影像進行定位並擷取隱藏的資訊。實驗證明，本研究能有效的嵌入兩階浮水印於全像影像中並抵抗隨機雜訊的攻擊，而資料隱藏實際輸出的全像片具有全彩、變圖和景深的效果可達到多重防偽的功能。The objective of this research is to propose a novel data hiding method for the dot-matrix hologram. The error diffusion of digital halftoning techniques and pseudo random number generation for addressing the halftone dots in six colors are need to make efficient use of the image area and to hide information. The result that binary image has error correction capability by BCH error correction code. After outputting the encoded hologram, the holographic image is captured and the hidden information is extracted by geometrical transformation. The results show that it is feasible to hide information in the dot matrix hologram and to withstand the noise attack. The output encoded hologram with true color image, switching feature and field depth can achieve multiple anti-counterfeiting functions.