Source：Journal of Real-Time Image Processing, vol.14, pp.41-50, 2016

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Presentation transcript:

A novel two-in-one image secret sharing scheme based on perfect black visual cryptography Source：Journal of Real-Time Image Processing, vol.14, pp.41-50, 2016 Authors：Peng Li, Ching-Nung Yang, Qian Kong Speaker ：Xiao-Shuang Li Date ： 2018/06/21

Outline Introduction Related Work Proposed Scheme Experimental Results Conclusions

Introduction Two-in-one ISS (TiOISS) Original image Shadow 1 Shadow 2 Previewed image Reconstructed image

Related Work (1/4) Perfect black VCS (PBVCS) The ‘OR’-ed vector of any k rows of consists of all ‘1’ Example: (2,3)- PBVCS Basis matrices:

Related Work (2/4) Sharing Secret image Shadow 1 Shadow 2 Shadow 3 Stacking

Related Work (3/4) Pixel processing with Boolean operations 1. Encoding process with m=3 A: Un-processed m gray secret pixels as a block : Randomly generated block : Security mask

Related Work (4/4) 2. Decoding process with m=3

Proposed Scheme(1/5) Construct gray share matrix Example: (2,3)- PBVCS Gray basis matrices : Randomly generated : the grayscale values are come from

Proposed Scheme(2/5) A diagram of embedding in black share matrix

Proposed Scheme(3/5) The flowchart of the proposed TiOISS scheme

Proposed Scheme(4/5) Security and contrast conditions 1. Security condition 2. Contrast condition

Proposed Scheme(5/5) The construction methods of PBVCS (2,n)-VCS by Naor and Shamir’s scheme (2,n)-PBVCS scheme from (2,n)-VCS

Experimental results(1/3) Secret image 256*256 pixels Encoded image S’ 256*512 pixels Shadow 1 350*750 Shadow 2 350*750 Shadow 3 350*750 Previewed secret image

Experimental results(2/3) The example using qGVCS Revealed image q=7 390*750 pixels a=0.19 Revealed image q=6 455*750 pixels a=0.26 Revealed image q=5 545*750 pixels a=0.29

Experimental results(3/3)

Conclusions Reveal a vague secret image by stacking Decoding the grayscale secret image by fewer XOR Embed more information in PBVCS to construct a TiOISS scheme Faster in Decoding than traditional TiOISS

Thank you!