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Table 4 QBSD quality assessment compared with other quality metrics for 2 out of 4 visual secret sharing

From: A novel quality assessment for visual secret sharing schemes

Metric Symbol    Square   
name T Letters Baboon sign Portrait Zebra
Quality Very    Very   
rank good Good Fair good Good Poor
QBSD 0.74 0.71 0.68 0.73 0.72 0.68
Blackness 0.73 0.75 0.66 0.74 0.73 0.74
SSIM 0.02 0.02 0.14 0.03 0.05 0.04
MSE 1.6e4 1.6e4 1.9e4 1.6e4 1.7e4 1.7e4
PSNR 5.99 5.86 5.35 6.00 5.89 5.86
Contrast 0.182 0.193 0.265 0.174 0.184 0.29