Table 2.

Confusion matrix of the testing results.

		Intec/HU		YOLOv4
				Threshold = 0.1		Threshold = 0.5		Threshold = 0.7
		Asbestos	Non-Asbestos	Asbestos	Non-Asbestos	Asbestos	Non-Asbestos	Asbestos	Non-Asbestos
Manually counted (NIOSH 7400)	Asbestos	46	13	54	5	53	6	52	7
	Non-asbestos	64	3586	12	3638	6	3644	5	3645
Accuracy		0.979		0.995		0.997		0.997
Precision		0.418		0.818		0.898		0.912
Recall		0.780		0.915		0.898		0.881
F1-score		0.544		0.864		0.898		0.897