適應性邊緣導向之可逆式資訊隱藏方法

Adaptive Edge-Oriented Reversible Data Hiding Scheme

宋文耀(Wen-yao Song)

指導教授 ： 曾顯文

朝陽科技大學/資訊學院/資訊管理系/碩士(2012年)

摘要

本篇研究提出了一個可逆式資訊隱藏，所謂的可逆式是指將機密訊息嵌入到原始影像之中形成偽裝影像，在取出機密訊息時也可將偽裝影像恢復成原始影像。在自然影像中影像的特性大多分為平滑區域、紋理和邊緣區域，在平滑區域鄰近像素值之間有很大的機率是很接近的或者是相同，因此在平滑區域使用鄰近像素計算差值可以產生高的峰值點，但是在複雜區域和紋理區域鄰近的像素值是接近或相同的可能性很低，因此本研究事先針對區塊判別其方向性，並給予各個區塊合適的掃描法以產生高的峰值點，再以直方圖修改技術將機密訊息嵌入到偽裝影像內。實驗結果顯示本方法有好的嵌入量以及不錯的影像品質。

關鍵字

邊緣導向 ； 適應性 ； 鄰近像素差值 ； 直方圖修改法 ； 可逆式資訊隱藏

並列摘要

This paper proposed a reversible data hiding method, reversible data hiding embeds secret information into original-image to produce the stego-image, and original image can be recovered without distortion after the hidden data is extracted. A natural-image usually contains smooth, texture and edge areas; In smooth region, the neighboring pixel are close or identical. Therefore the differences between adjacent pixels produce high peak point in the histogram. However, in edge area and texture area, adjacent pixels are not similar, In our study, direction of each block is determined previously. Different scanning order is applied to each block in order to generate high peak point, then histogram modification technique is employed to embed the secret information. Our experimental results show the proposed method has a high embedded capacity and still maintains a high stego-image quality.

並列關鍵字

Histogram Modification ； Reversible Data Hiding ； Adjacent Pixel Difference ； Edge-Oriented ； Adaptive

參考文獻

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