Paper Info
Title
A multiple-level visual secret-sharing scheme without image size expansion
Abstract
In traditional VSS schemes, the size of the share image is substantially expanded since each pixel of the secret image is mapped onto a block consisting of several pixels. In addition, the quality of the reconstructed secret image is normally degraded in contrast, especially for halftone images. This study proposes a VSS scheme that maps a block in a secret image onto one corresponding equal-sized block in each share image without image size expansion. Two types of techniques, including histogram width-equalization and histogram depth-equalization, are proposed to generate the corresponding share blocks containing multiple levels rather than two levels based on the density of black pixels on the blocks for a secret block. In the former technique, the gray-scale image histogram is obtained by uniformly splitting the range of the pixel gray levels in the secret image, while in the latter the buckets are created so that the area of each bucket is roughly constant by containing approximately the same number of pixels. The proposed schemes significantly improve the quality of the reconstructed secret image compared to several previous investigations.
Year
DOI
Venue
2007
10.1016/j.ins.2007.05.011
Inf. Sci.
Keywords
Field
DocType
histogram depth-equalization,multiple-level visual secret-sharing scheme,corresponding equal-sized block,halftone image,reconstructed secret image,image size expansion,gray-scale image histogram,corresponding share block,secret image,secret block,share image
Histogram,Computer vision,Secret sharing,Binary image,Halftone,Pixel,Artificial intelligence,Image histogram,Image resolution,Mathematics,Visual cryptography
Journal
Volume
Issue
ISSN
177
21
0020-0255
Citations 
PageRank 
References 
50
2.07
9
Authors
5
Name
Order
Citations
PageRank
Yung-Fu Chen115520.85
Yung-Kuan Chan247633.67
Ching-chun Huang31359.63
Meng-hsiun Tsai411613.67
Yen-Ping Chu560233.26