【摘 要】
：
(k,n) halftone visual cryptography (HVC) is proposed based on Shamir\'s secret sharing (HVCSSS),and through this method a binary secret image can be hided into n halftone images,and the secret image can be revealed from any k halftone images.Firstly,usi
【机 构】
：
College of Information Engineering, Beijing Institute of Graphic Communication, Beijing 102600, Chin
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(k,n) halftone visual cryptography (HVC) is proposed based on Shamir\'s secret sharing (HVCSSS),and through this method a binary secret image can be hided into n halftone images,and the secret image can be revealed from any k halftone images.Firstly,using Shamir\'s secret sharing,a binary secret image can be shared into n meaningless shares;secondly,hiding n shares into n halftone images through self-hiding method;and then n extracted shares can be obtained from n halftone images through self-decrypt method;finally,picking any k shares from n extracted shares,the secret image can be revealed by using Lagrange interpolation.The main contribution is that applying Shamir\'s secret sharing to realize a (k,n) HVC,and this method neither requires code book nor suffers from pixel expansion.Experimental results show HVCSSS can realize a (k,n) HVC in gray-scale and color halftone images,and correct decoding rate (CDR) of revealed secret image can be guaranteed.
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