植基於模式函數之適應性資訊隱藏技術

Adaptive Information Hiding Schemes Based on Exploiting Modification Direction

鄭聚賦(Jyu-fu Chen)

指導教授 ： 曾顯文

朝陽科技大學/資訊學院/資訊管理系/碩士(2013年)

摘要

資訊隱藏技術研究之目的在於，如何透過科技技術的方法將重要的機密訊息藏入於影像之中，這些被嵌入機密訊息的影像我們必須保持其良好的視覺品質，以確保在公開的網際網路傳遞中即使被不法的第三方攔截，仍不易察覺當中藏有重要的機密訊息，使機密訊息得以躲避被竊取、竄改的風險，以達成資訊隱藏之目的。
資訊隱藏技術中，模式函數藏匿法通常以兩個像素值為一組利用函數式計算像素值，而函數基底的大小同時直接影響嵌入量的多寡，接著將進制轉換的機密訊息與函數值做比較，調整像素值直至符合機密訊息，取代的偽裝像素值要能達到較低程度的失真，取代後的偽裝像素值即完成模式函數藏匿法的嵌入。
本論文，係依據人類視覺對於像素值差異大的區域感知能力較低，即使更動較大也不易察覺的特性，利用像素差異值及區塊預測的方法，而做適應性嵌入，並規範鄰近像素做為參考點進行像素值取代。實驗結果顯示我們所提出的方法，在針對像素差異值藏入不同機密訊息量後，能夠提供不錯的影像品質以及一定水準的藏入量。

關鍵字

模式函數藏匿法 ； 適應性 ； 資訊隱藏

並列摘要

Abstract
Information hiding technology research is a subject that can embed secret data into cover image. Good visual quality of stego image is necessary to makes the illegal third-party interception ignore detecting the image. In recent years, modulo function become interesting discuss object because of its high capacity and good visual quality. Today, in order to improve cover image capacity and stego-image quality, we employ the characteristics of human visual system, calculate the pixel value difference from non overlapping block of two consecutive pixels, then apply adaptive method to control smooth area and edge area embed amount. In smooth area we embed less secret message for maintaining the visual quality, and in the edge area we embed more secret message to increase the hiding capacity. From the experimental results, the proposed methods embedding more secret data than previous techniques and still maintain good visual quality.

並列關鍵字

pixel value difference ； modulo function ； data hiding

參考文獻

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