Random Grids-Based Threshold Visual Secret Sharing with Improved Visual Quality
Visual secret sharing (VSS) by random grids (RG) has gained much attention since it avoids the pixel expansion problem as well as requires no codebook design. However, most of the previous RG-based threshold VSS still suffer from low visual quality or worse reconstructed secrets when more shares are stacked. In this paper, a new RG-based VSS with improved visual quality is proposed. The random bits are utilized to improve the visual quality as well as to decrease the darkness of the reconstructed secret image in the proposed scheme. Experimental results and analyses show the effectiveness of the proposed scheme.
KeywordsVisual cryptography Visual secret sharing Random grids Contrast Progressive evaluation
The authors would like to thank the anonymous reviewers for their valuable comments. This work is supported by the National Natural Science Foundation of China (Grant Number: 61602491).
- 3.Yan, X., Wang, S., El-Latif, A.A.A., Niu, X.: Visual secret sharing based on random grids with abilities of AND and XOR lossless recovery. Multimedia Tools Appl., 1–22 (2013)Google Scholar
- 9.Yan, X., Wang, S., El-Latif, A.A.A., Niu, X.: Random grids-based visual secret sharing with improved visual quality via error diffusion. Multimedia Tools Appl., 1–18 (2014)Google Scholar
- 10.Kuwakado, H., Tanaka, H.: Image size invariant visual cryptography. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 82(10), 2172–2177 (1999)Google Scholar
- 15.Yan, X., Liu, X., Yang, C.N.: An enhanced threshold visual secret sharing based on random grids. J. Real-Time Image Process., 1–13 (2015)Google Scholar
- 26.Yan, X., Wang, S., Niu, X.: Threshold progressive visual cryptography construction with unexpanded shares. Multimedia Tools Appl., 1–18 (2015)Google Scholar