Chinese Journal of Network and Information Security ›› 2020, Vol. 6 ›› Issue (4): 140-147.doi: 10.11959/j.issn.2096-109x.2020049

• Papers • Previous Articles     Next Articles

Analysis and design of visual secret sharing scheme for gray image

Jian LIU1,2(),Yi ZHANG1,2,Yuling LIU3,Hao HU4   

  1. 1 Information Technology &Security Test and Evaluation Center,Beijing 100083,China
    2 The 15th Research Institute of China Electronics Technology Group Corporation,Beijing 100083,China
    3 Institute of Information Engineering,Chinese Academy of Sciences,Beijing 100190,China
    4 Information Engineering University,Zhengzhou 450001,China
  • Revised:2020-06-05 Online:2020-08-15 Published:2020-08-13
  • Supported by:
    The National Key R&D Program of China(2016YFF0204003)

Abstract:

Existing gray visual secret sharing (GVSS) convert the original image into black-white binary image for processing,which causes the pixel information loss problem.For this purpose,a kind of GVSS based on gray superposition was proposed.For each gray-scale pixel,the corresponding encoding matrix was designed to generate gray share image.On this basis,the schemes for (2,2),(2,n),(n,n) threshold structures were designed.Compared with the existing schemes,the proposed scheme effectively reduces pixel expansion and achieves the perfect reconstruction of gray secret images.

Key words: visual secret sharing, gray image shares, grayscale superposition, lossless decoding

CLC Number: 

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