Compressible (r,n) Threshold Secret Image Sharing Scheme
YU Mei-sheng · Computer Engineering and Applications Journal · 2006
A compressible(r,n) threshold secret image sharing scheme is proposed which can overcome the shortcomings of VSS(Visual secret sharing) scheme,based on Shamir's threshold secret scheme.The size of each shadow image is 1/r times of the secret image.The restore image is the same as the secret one when the value of all pixels is smaller than 250.Then the authors improved it and obtained a lossless secret image shring scheme when the pixels' value is bigger than 250.