Research Article
Machine Vision Based Automatic Detection Method of Indicating Values of a Pointer Gauge
Table 4
Comparisons between manual reading and visual detection.
|
The pressure output of the checkpoint (MPa) | The indicating value of visual detection | The indicating value of manual reading |
Comparison (error 1 − error 2) | Positive stroke |
Error 1: (MPa) |
Relative error 1: (%) | Positive stroke |
Error 2: (MPa) |
Relative error 2: (%) | Standard gauge: (MPa) | Tested gauge: (MPa) | Standard gauge: (MPa) | Tested gauge: (MPa) |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.025 | 0.024343 | 0.025650 | 0.001310 | 5.37000 | 0.024 | 0.026 | 0.002 | 8.333 | 0.08202 | 0.050 | 0.048727 | 0.050200 | 0.001473 | 3.02296 | 0.049 | 0.051 | 0.002 | 4.082 | 0.03533 | 0.075 | 0.074387 | 0.075470 | 0.001080 | 1.45644 | 0.075 | 0.076 | 0.001 | 1.333 | 0.01225 | 0.100 | 0.100408 | 0.100100 | 0.000308 | 0.30675 | 0.099 | 0.101 | 0.002 | 2.02 | 0.02051 | 0.125 | 0.125060 | 0.126000 | 0.000940 | 0.75164 | 0.125 | 0.126 | 0.001 | 0.8 | 0.00706 | 0.150 | 0.149762 | 0.150900 | 0.001140 | 0.75987 | 0.15 | 0.152 | 0.002 | 1.333 | 0.01219 | 0.175 | 0.174613 | 0.177626 | 0.003010 | 1.72553 | 0.175 | 0.173 | 0.002 | 1.1429 | 0.01440 | 0.200 | 0.198316 | 0.202263 | 0.003950 | 1.99026 | 0.2 | 0.203 | 0.003 | 1.5 | 0.01105 | 0.225 | 0.225053 | 0.226146 | 0.001090 | 0.48566 | 0.224 | 0.227 | 0.003 | 1.339 | 0.01230 | 0.250 | 0.249344 | 0.249057 | 0.000287 | 0.11510 | 0.249 | 0.252 | 0.003 | 1.205 | 0.01233 |
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