Table 1 Comparisons between different types of LBP extensions. The times calculations are based on training and evaluating 27,788 images of size pixels.

Feature vector length

Feature vector extraction time (sec)

Model training time (sec)

Trained model number of features

Model's feature extraction time (sec)

LBP Histogram

978

10.779

43.927

22

9.117

MB-LBP

8464

31.814

761.491

41

0.368

Sobel-LBP

2049

4.042

298.221

75

2.026

CoLBP

3164

25.245

219.693

38

0.296

CoLBP

3164

25.245

169.158

18

0.280