Browsing by Author "Fang, Wen-Pinn"

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Universal share for the sharing of multiple images
(2007-06-01)
Fang, Wen-Pinn
;
Lin, Ja-Chen
;
資訊工程學系
;
Department of Computer Science
To share numerous grey-valued images (or numerous color-valued images), this study presents a system with a universal share. A company organizer can use this universal share to attend the recovery meeting of any shared image. No storage space is wasted; i.e. for each shared image, the total storage space occupied by all generated shares (including the universal share) is identical to the image size.
Visual Cryptography (VC) with non-expanded shadow images: Hilbert-curve approach
(2008)
Lin, Sen-Jen
;
Lin, Ja-Chen
;
Fang, Wen-Pinn
;
資訊工程學系
;
Department of Computer Science
Visual cryptography with extra ability of hiding confidential data
(2006-04-01)
Fang, Wen-Pinn
;
Lin, Ja-Chen
;
資訊工程學系
;
Department of Computer Science
We present a two-in-one visual cryptography (VC) scheme that not only shares an image of moderate confidentiality between two noisy transparencies, but also hides in these two transparencies a more confidential text file describing the image. None of the transparencies alone can reveal anything about the image or text. Later, people can view the image by simply stacking the two transparencies; on the other hand, after certain simple computations, the more confidential text data can also be extracted. We also introduce an alternative version in which the decoding of both the image and text requires no computer. (C) 2006 SPIE and IS&T.