| Project/Area Number |
22500003
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fundamental theory of informatics
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| Research Institution | Ibaraki University |
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Principal Investigator |
KANO Mikio 茨城大学, 工学部, 教授 (20099823)
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| Co-Investigator(Kenkyū-buntansha) |
UNO Miyuki 茨城大学, 大学教育センター, 講師 (90567843)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | カラー視覚暗号 / カラー視覚カードゲーム / 離散構造 / 視覚暗号 / 視覚カードゲーム / カラー離散数学 / 視覚分散暗号 / 視覚型秘密分散法 / カラー化されたVCS / カラー化されたカードゲーム / 視覚型暗号 |
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| Research Abstract |
A visual cryptography scheme (VCS) was started to encode a secret image comprised of black and white pixels into some shares, and a colored VCS, in which the secret image is comprised of colored pixels, also has been studied. But known constructions of colred VCS lose a lot of contrast in reconstructed images. Therefore we cannot use it practically. In this research, we introduce a new colored VCS, which uses only four colors, black, white, red and green, and propose its construction with high contrast by using the property that a stacking of a red subpixel and a green subpixel results a black subpixel. We provide a construction of such a colored (2, n)-VCS with highest contrast. Moreover, we propose a new visual 4-colored card games for two parties of boys and girls, respectively, such that each boy and each girl receives a card and when a boy and a girl stack their card together, a secret image is recovered. We propose a construction of this colored game with high contrast.
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