... 8000 as the training sample images, and the other contains 8000 as the testing sample images. Then, for each type of crack, we have one 2000 images for training and the other 2000 images for testing.5.2. ... 13: Performance evaluation for the cross-validation processes. (a) Comparison on the Precision, (b) comparison on the Recall. the selected features with features used in other approaches, for example, ... analysis, the starting code begins with 1, andwithanorderof1,2,3,and4.AsFigure 5(c) illustrated, codes 1 and 3 stand for the horizontal and vertical direction,while codes 2 and 4 stand for the two...