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Table 5 QBSD measurement of the same images reconstructed with and without pixel expansion, m=4

From: A novel quality assessment for visual secret sharing schemes

QBSD Symbol    Square   
values T Letters Baboon sign Portrait Zebra
Quality Very    Very   
rank good Good Fair good Good Poor
Size invariant       
Reconstruction 0.80 0.78 0.73 0.83 0.77 0.70
Reconstruction       
With expansion 0.82 0.81 0.79 0.84 0.80 0.76