機密訊息重編碼結合像素值排序法之雙影像無失真資訊隱藏方法

Dual Images Lossless Data Hiding Methods based on Secret Data Re-encoding and Pixel Value Ordering

劉家維(Jia-Wei Liu)

指導教授 ： 呂慈純

朝陽科技大學/資訊學院/資訊管理系/碩士(2017年)

摘要

雙影像技術近年來被大量應用於可逆式資訊隱藏方法中，大多數學者所提出的資訊隱藏方法都將重點放在如何尋找最佳預測值，使偽裝影像失真程度能夠降低。本研究發現影響影像品質效果的關鍵與藏入的機密訊息大小也有相當程度的關係，一般的資訊隱藏技術中，大多會先將藏入的機密訊息先做進制上的更改，以十進制為基底的機密訊息與像素值進行計算，包含相加、相減以及平均法的計算等。然而當機密訊息過大時，修改後的偽裝像素值會與原始影像像素值相差甚大，導致影像的失真程度增大，影響影像品質。
因此，本論文延伸Lu等學者在2015年所提出的中間對折策略的想法，並且對折後的機密符號進行重新編碼的前處理，再進行嵌入。此外，結合像素值排序法進行第二次的嵌入，期望能夠有效地將第一次嵌入時所造成的失真度進行抵銷，讓偽裝像素更接近原始的像素值，達到高藏量並得到更佳影像品質。

關鍵字

可逆式資訊隱藏 ； 雙影像技術 ； 重編碼規則 ； 像素值排序

並列摘要

Dual images lossless data hiding techniques have been broadly applied in reversible information hiding in recent years. Most of the methods focus on how to find the best predictor value to decrease the image distortion. In our research, we found that the secret data size is also an important indicator to influence the image quality.
Therefore, this research extends Lu et al.’s method’s center folding scheme which proposed in 2015 and proposes a re-encoding scheme that recodes the secret symbols before embedding processing.
After that, the proposed scheme combines the pixel values ordering method for second round embedding. According to the experimental results, the proposed method can effectively maintain the image quality and achieve a high embedding capacity with relatively little distortion.

並列關鍵字

Reversible Hiding ； Dual Images ； Re-encoding ； Pixel Value Ordering

參考文獻

[1] A.M. Alattar, “Reversible Watermark Using the Difference Expansion of a Generalized Integer Transform,” IEEE Transactions on Image Processing, Vol. 13, pp. 1147-1156, 2004.

[2] C.C. Chang, Y.C. Chou, and T.D. Kieu,“Information Hiding in Dual Images with Reversibility,”Proceedings of Third International Conference on Multimedia and Ubiquitous Engineering, pp. 145-152, 2009.

[3] C.C. Chang, T.D. Kieu, and Y.C. Chou,“Reversible Data Hiding Scheme Using Two Steganographic Images,”Proceedings of IEEE Region 10 Intermational Conference (TENCON), pp. 1-4, 2007.

[4] C.C. Chang, T.C. Lu, G. Horng, Y.H. Huang, and Y.M. Hsu,“A High Payload Data Embedding Scheme Using Dual Stego-images with Reversibility,” Proceedings of Third International Conference on Information, Communications and Signal Processing, pp. 1-5, 2013.

[5] X. Gui, X. Li, and B. Yang, “A High Capacity Reversible Data Hiding Scheme Based on Generalized Prediction-Error Expansion and Adaptive Embedding,” Signal Processing, Vol. 98, pp. 370-380, 2014.