Fig. 7
From: Unsupervised learning approach to automation of hammering test using topological information
ROC curve for the delamination type blocks. Higher values of delamination inclination means deeper defects and therefore less audible, recordable sounds. This causes a drop in performance in pair with the inclinaison of the delamination. However, considering the still high efficiency for delaminations up to 45° and knowing that the vast majority of field-found delamination falls in this range, our proposed method can be considered satisfying