Browsing by Author "Pan, HK"

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A secure data hiding scheme for binary images
(2002-08-01)
Tseng, YC
;
Chen, YY
;
Pan, HK
;
資訊工程學系
;
Department of Computer Science
This letter presents a novel steganography scheme capable of concealing a piece of critical information in a host message which is a binary image (e.g., a facsimile). A binary matrix and a weight matrix are used as secret keys to protect the hidden information. Given a host image of size m x n, the proposed scheme can conceal as many as [log(2) (mn + 1)] bits of data in the image by changing, at most, two bits in the host image. This scheme can provide a higher security, embed more information, and maintain a higher quality of the host image than available schemes.
Data hiding in 2-color images
(2002-07-01)
Tseng, YC
;
Pan, HK
;
資訊工程學系
;
Department of Computer Science
In an earlier paper [4], we proposed a steganography scheme-for hiding a piece of critical information in a host binary image. That scheme ensures that, in each m x n image block of the host image, as many as [log(2)(mn + 1)] bits can be hidden in the block by changing at most 2 bits in the block. In this paper, we propose a new scheme that improves [4] in its capability to maintain higher quality of the host image after data hiding by sacrificing some data hiding space. The new scheme can still offer a good data hiding ratio. It ensures that, for any bit that is modified in the host image, the bit is adjacent to another bit which has a value equal to the former's new value. Thus, the hiding effect is quite invisible.
Secure and invisible data hiding in 2-color images
(2001)
Tseng, YC
;
Pan, HK
;
資訊工程學系
;
Department of Computer Science
In an earlier paper [1], we propose a steganography scheme for hiding a piece of critical information in a host binary image. That scheme ensures that in each m x n image block of the host image, as many as [log(2) (mn+ 1)] bits can be hidden in the block by changing at most 2 bits In the block. As a sequel of that work, in this paper we propose a revised scheme that can maintain higher quality of the host image by sacrificing some data hiding space. The new scheme can still offer a good data hiding ratio. It ensures that for any bit that is modified in the host image, the bit is adjacent to another bit which has a value equal to the former's new value. Thus, the hiding effect is quite invisible.