Browsing by Author "Wang, RZ"

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Hiding data in images by optimal moderately-significant-bit replacement
(2000-12-07)
Wang, RZ
;
Lin, CF
;
Lin, JC
;
資訊工程學系
;
Department of Computer Science
A data hiding technique for the storage and transmission of important data is proposed. It embeds the important data in the moderately-significant-bit of an image, and applies a global substitution step and a local pixel adjustment process to reduce any image degradation. Experimental results show that the visual quality of the resulting image is acceptable.
Image hiding by optimal LSB substitution and genetic algorithm
(2001-03-01)
Wang, RZ
;
Lin, CF
;
Lin, JC
;
資訊工程學系
;
Department of Computer Science
In this paper, we develop a novel method to embed important data in the host image so that the interceptors will not notice about the existence of the data. The basic concept of the proposed method is by simple LSB substitution. To prevent illicit access of data and increase the system performance, the method of randomized process and the optimal LSB substitution are proposed. The effectiveness of the optimal LSB substitution in the worst case is proved. We also develop a genetic algorithm to solve the problem of hiding important data in the rightmost k LSBs of the host image, which may involve a huge computation time to find the optimal result when k is large. Finally, based on the concept of perceptual modeling, an improved hiding technique is developed to obtain a high-quality embedding result. Experimental results will reveal that the quality of the embedding result will not be seriously degraded, and is near optimal by utilizing the proposed method. (C) 2001 Pattern Recognition Society. Published by Elsevier Science Ltd. All rights reserved.