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A Study of Adaptive Reversible Steganography Based on Image Interpolation
|關鍵字:||reversible/lossless steganorgraphic technique;可逆式/無失真偽裝學技術;difference expansion;image interpolation;bilinear interpolation;bicubic interpolation;classification map;差值擴張;影像內插法;雙線性內插法;雙立方內插法;分類圖||出版社:||資訊科學與工程學系所||引用:|| M. Alattar, “Reversible watermark using the difference expansion of a generalized integer transform,” IEEE Transactions on Image Processing, vol. 13, no. 8, pp. 1147-1156, Aug. 2004.  J. M. Barton, “Method and apparatus for embedding authentication information within digital data,” U.S. Patent 5 646 997, Jul. 8, 1997.  W. Bender, N. Morimoto, and A. Lu, "Techniques for data hiding," IBM Systems Journal, vol. 35, pp. 313-336, 1996.  M. U. Celik, G. Sharma, A. M. Tekalp, and E. Saber, “Lossless generalized-LSB data embedding,” IEEE Transactions on Image Processing, vol. 14, no. 2, pp. 253-266, Feb. 2005.  C.C. Chang, J.Y. Hsiao, C.S. 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Reversible/lossless steganography allows the extraction of a secret message and the restoration of the original image without distortion from the stego-image. It is a very important technique that attracts accumulative interests on certain applications, such as authenticity or content integrity, conservation of a valuable art image and reference of medical or military images, etc. Although Tian's difference expansion scheme is regarded as a breakthrough method in recent literature, it suffers from two problems: the embeddable location is considered insufficient and the embedding payload control capability is weak. On the other hand, an adaptive reversible embedding scheme with classification map is proposed by Lee who attempts to increase the embedding payload of Tian's scheme, but the prevention of pixel overflow/underflow is not taken into consideration. This outcome leads to the possible annoying salt-and-pepper noise occurrence on the stego-image after embedding. Moreover, the other issue is the inability to embed the secret message for pure black blocks under Lee's scheme which results in lost partial embedding payload size.
Based on the property of image interpolations, three adaptive reversible steganographic techniques with different sizes of additional information were proposed in this dissertation for solving the above problems. In the first proposed scheme, the kernel of bilinear interpolation is adopted to improve the number of the embeddable locations in Tian's scheme while maintaining the quality of the stego-image the required level. In addition, a simplified classification map is proposed in combination with Lee's adaptive embedding rule to solve the second problem in Tian's scheme so the secret message is able to be embedded adaptively while effectively reducing the classification map of Lee's scheme. The second proposed algorithm adopts a more powerful bicubic interpolation as the pixel prediction to solve the first problem of Tian's scheme. With a powerful bicubic interpolation more embeddable locations can be defined and the quality of generated difference is also taken into consideration. In addition, the statistical adaptive embedding algorithm with lower loading of additional information is proposed to overcome the second problem in Tian's scheme. First, the complexity of the neighboring pixels and the size of the generated difference for the embeddable locations are generalized as the variance conditional using statistics. Combined with the maximum modifiable degree of the predicted value of the embeddable location, the suitable embedding capacity for each embeddable location can then be obtained. Finally, the pixel overflow/underflow problem in Lee's scheme is addressed by, the third proposed scheme, a novel adaptive reversible embedding scheme with a multifunction location map. After obtaining the pixels differences generated by the first proposed scheme, the differences are classified into several sets and then assigned different embedding manners and embedding payloads. After that, the proposed multifunction location map is generated including the two embedding functions: the recognition of the original classification of the embedded difference and the prevention of the pixel underflow/overflow. However, the size of multifunction location map is not greater than Lee's classification map.
In this dissertation, various standard and medical images are adopted as the test images and the experimental results revealed that the three proposed schemes presented better quality stego-image and can carry a larger embedding payload than existing DE-based schemes, such as Tian's, Alattar's and Lee's schemes.
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