Feature Tracking for Target Identification in Acoustic Image Sequences

Table 4

Statistical information of feature tracking.

Local features	Number of valid frames	Tracking rate (%)	Section I		Section II		Target type
			Average offset (m)	Total offset (m)	Average offset (m)	Total offset (m)
Hessian + SURF	30	78.95	0.27	2.62	0.28	2.70	Dynamic
	37	97.37	0.01	0.02	0.01	0.02	Static
	0	0.00	0.45	0.58	0.44	0.57	False
	0	0.00	0.02	0.03	0.02	0.03	Cable
	0	0.00	0.36	1.45	0.35	0.57	False
	0	0.00	0.09	0.05	0.09	0.03	Cable
	0	0.00	0.40	1.74	0.42	0.08	False
DoG + SIFT	16	42.11	0.18	2.35	0.19	1.47	False
	25	65.79	0.02	0.02	0.02	0.01	Static
	0	0.00	0.07	0.06	0.07	0.12	Cable
	0	0.00	0.01	0.01	0.02	0.02	Cable
	0	0.00	0.01	0.01	0.01	0.02	Cable
	0	0.00	0.02	0.01	0.02	0.02	Cable
MSER + SURF	8	21.05	0.19	2.01	0.20	1.07	False
	29	76.32	0.01	0.02	0.01	0.01	Static
	0	0.00	0.01	0.02	0.01	0.02	Cable
	0	0.00	0.14	0.72	0.07	0.57	False
	0	0.00	0.08	0.58	0.09	1.51	False
FAST + BRISK	29	76.32	0.02	0.04	0.01	0.01	Static