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Size-invariant extended visual cryptography with embedded watermark based on error diffusion.
Bin Yan
Ya-Fei Wang
Lingyun Song
Hong-Mei Yang
Published in:
Multim. Tools Appl. (2016)
Keyphrases
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halftone images
error diffusion
visual cryptography
gray scale
data hiding
image quality
black and white
gray level
human visual system
original images
secret sharing scheme
frequency domain
binary images
digital watermarking
multiple images