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- W2126248247 abstract "Multi-pixel encoding is an emerging method in visual cryptography for that it can encode more than one pixel for each encoding run. Nevertheless, in fact its encoding efficiency is still low because of that the encoding length is invariable and very small for each run. This paper presents a novel multi-pixel encoding called pixel-block aware encoding. It scans the secret image by zigzag and perceives a pixel block with as many pixels as possible to encode for each run. A pixel-block consists of consecutive pixels of same type during the scanning. The proposed scheme has advantage in encoding efficiency over singlepixel encoding and other known multi-pixel encoding methods. Furthermore, this scheme can work well for both threshold access structure and general access structure and well for both gray-scale and chromatic images without pixel expansion. The experimental results also show that it can achieve good quality for overlapped images." @default.
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- W2126248247 date "2008-12-01" @default.
- W2126248247 modified "2023-09-26" @default.
- W2126248247 title "Visual Cryptography for General Access Structure Using Pixel-block Aware Encoding" @default.
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- W2126248247 doi "https://doi.org/10.4304/jcp.3.12.68-75" @default.
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