Symbol spotting for architectural drawings: state-of-the-art and new industry-driven developments

Table 4 Evaluation of the proposed symbol spotting approach on the GREC contest dataset [5], ideal case (best overall performance shown in italics)

Method		P	R	F	RecR	AveP
Proposed	TH = 0.950*	0.989	0.947	0.968	97.00%	0.00
	TH = 0.925	0.986	0.962	0.974	97.60%	2.40
	TH = 0.900	0.985	0.977	0.981	98.30%	2.60
	TH = 0.875	0.983	0.992	0.987	100.00%	3.60
	TH = 0.850	0.966	0.992	0.979	100.00%	4.30
Nayef and Breuel [57], as reported in [5]		0.620	0.990	0.760	99.31%	18.75