可逆資料隱藏基於不同的區塊分割方法

REVERSIBLE DATA HIDING BASED ON DIFFERENCE BLOCK DIVISION METHOD

許博閔(Po-Ming Hsu)

指導教授 ： 蔡明傑

大同大學/電機資訊學院/電機工程學系所/碩士(2009年)

摘要

本篇論文提出了兩個可逆式資料隱藏的方法，第一個是利用整數轉換和直方圖的結合，其逆轉換主要是利用相鄰的像素值來還原原始像素值。由轉換過後產生的差值的直方圖，並且利用不同大小的區塊，因為重疊兩層差值直方圖的方式，不但可以把資料嵌入到影像中，所得到的資料量也較高，如此來達到資料隱藏的目的。第二個則是使用預測編碼和直方圖的結合，並利用切割成不同區塊來修改些微的像素值來達到資料隱藏的目的。由實驗結果可知，我們的容量具有較好的隱藏容量和PSNR，而當取出資料後，皆可以恢復成原來的影像。

關鍵字

直方圖位移 ； 整數轉換 ； 差值 ； 預測編碼

並列摘要

This thesis presents two reversible data hiding methods. The first reversible data hiding method embeds data used on integer transform and histogram shifting. The inverse transform exploits the correlations among adjacent pixels in an image. We calculate the mean and difference values of the adjacent pixels. We use different block of size and overlapping two layer difference value of histogram, not only we can embed data into the image, but also data capacity is better. So the object of data hiding is arrived. The second reversible data hiding method embeds data used on prediction and histogram. We divide difference block size that pixel values slightly to embed data into the image. Experimental results know that our capacity is better payload and PSNR. After the data hidden data have been extracted, the image can recover without any distortion.

並列關鍵字

histogram shifting ； integer transform ； difference value ； prediction

參考文獻

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