新的高動態範圍影像資訊隱藏演算法

Abstract

近年來數位影像上的重要發展在於如何利用數位化的資料真實呈現自然世界的真實色彩，高動態範圍影像即為此一研究中重要的趨勢。資訊隱藏有別於密碼學中對資訊內容的保護，其特性為隱藏資訊本身的存在，使人難以察覺該媒體之中藏有資訊，對於藉由網路傳輸的資訊形成了一種保護色。就我們所知，將資訊隱藏技術應用在高動態範圍影像上，至今仍無相關的論著。本文利用高動態範圍影像與生俱來的差異性對影像進行分區，劃分為區塊與邊界兩個部分，再透過我們提出的新的高動態範圍影像資訊隱藏演算法，將資訊嵌入，產生不易為外人所察覺的視覺效果，達到高資訊嵌入量及低失真之目的。實驗結果顯示：我們的技術首開先例，成功地在高動態範圍影像上提出資訊隱藏演算法，達到肉眼不易察覺與原始影像差異之效果。

In recent years, an important development on digital images concentrated on how to present real world color by the information of digitization. High dynamic range (HDR) image is an important trend in this studying. Data hiding, whose characteristic is to hide the existence of information itself, is different from the encryption in cryptography. Data hiding makes people hard to perceive there’s something hidden in the information, and produce a kind of protective coloration with information that we transmit through the Internet. To the best of our knowledge, no literatures have ever addressed how to employ a HDR image in the technology of data hiding. In this paper, we utilize the HDR images innate difference between pixels to classify all pixels into two parts of block area and edge area. Then, according to the new algorithm that we proposed, we can embed information in HDR images, which are hard to perceive. We provide a larger embedding capacity and to minimize the distortion of the stego image. Experimental results demonstrate that our algorithm is feasible to produce a data hiding HDR image with difficult to perceive differences between original image and it.