Table 4. Comparison with mainstream algorithms.

	Method	COCObase			COCOnovel
		AP	AR10	AR100	AR10	AR100
Localization	FCOS (baseline)	-	-	-	10.53	24.40
	RPN	-	-	-	7.5	20.10
	IoU-aware	-	-	-	9.78	22.23
	OLN-RPN	-	-	-	11.70	27.40
	Cascade RPN	-	-	-	12.62	27.69
	OWP	-	34.52	54.10	14.51	31.26
	OWP+NS (Ours)	-	35.67	55.45	15.78	32.33
Classification	FCOS (baseline)	44.21	55.33	59.23	-	-
	Joint (OWP+classification)	46.01	58.24	63.45	11.12	26.89
	Joint+unknown	46.21	60.42	64.85	11.32	27.82
	Class-Aware OLN	-	-	-	13.30	26.50
	Joint+BS+OOD (ours)	47.72	61.76	66.73	12.44	28.97