Machine Vision Based Automatic Detection Method of Indicating Values of a Pointer Gauge

Table 3

The test gauge detection results.

The pressure output of the checkpoint (MPa)	The indicating value of tested gauge								The cited errors; (the absolute error/range)
	Positive stroke		Error 1 (visual detection-weights value)	Error 2 (manual reading-weights value)	Negative stroke		Error 1 (visual detection-weights value)	Error 2 (manual reading-weights value)
	Visual detection	Manual reading			Visual detection	Manual reading
0	0	0	0	0	0	0	0	0	0
0.025	0.025650	0.026	0.000650	0.001	0.027084	0.028	0.002084	0.003	0.26/0.83
0.050	0.050200	0.051	0.000200	0.001	0.051623	0.052	0.001623	0.002	0.08/0.65
0.075	0.075470	0.076	0.000470	0.001	0.077778	0.078	0.002778	0.003	0.19/1.11
0.100	0.100100	0.101	0.000100	0.001	0.101095	0.102	0.001095	0.002	0.04/0.44
0.125	0.126000	0.126	0.001000	0.001	0.126106	0.127	0.001106	0.002	0.4/0.44
0.150	0.150900	0.152	0.000900	0.002	0.151486	0.153	0.001486	0.003	0.36/0.59
0.175	0.177626	0.173	0.002626	0.002	0.177678	0.179	0.002678	0.004	1.05/1.07
0.200	0.202263	0.203	0.002263	0.003	0.202445	0.204	0.002445	0.004	0.90/0.978
0.225	0.226146	0.227	0.001146	0.002	0.226223	0.228	0.001223	0.003	0.46/0.49
0.250	0.249057	0.252	0.000940	0.002	0.249057	0.252	0.000940	0.002	0.38/0.38