ONLINE TEST Sample Clauses

ONLINE TEST. An online test was conducted with live video from the surveillance camera installed at southbound I-5 near the NE 92nd Street over-crossing. Live video signals were transmitted to the test computer via a fiber cable link between the WSDOT TSMC and the STAR Lab. Selection of this site enabled us to examine the robustness and reliability of the VVDC system when applied to live video images generated from a typical surveillance camera. In comparison to an ideal test condition, the image quality of this data set was seriously affected by low-intensity rain and wet pavement. Although the image displacements resulting from the camera’s vibration could be ignored, the moving objects were very small relative to the field of view. Additionally, reflections of vehicle lights on wet pavement became another remarkable source of disturbance. Therefore, this test was more challenging than the two offline tests described earlier. The online test results for this location are summarized in Table 7-5. The overall accuracy of the vehicle count was 97.73 percent, and the truck count accuracy was 91.53 percent. The performance of the VVDC system was slightly lower in this online test than the offline tests. However, given that the test conditions were more complicated and challenging, the accuracy levels achieved during this online test were deemed satisfactory. In-depth reasons for the causes of each detection error are summarized in Table 7-6. Table 7-5: Results of the Online Test at Southbound I-5 Near the NE 92nd Street Over- crossing Time Period 12 minutes Location: Southbound I-5 near the 92nd Street Over-crossing Lane 4 Lane 3 Lane 2 Lane 1 Subtotal Ground- Truth # of Trucks 13 36 5 5 59 Total # of Vehicles 388 378 380 170 1316 System Detected # of Trucks 14 37 6 5 62 Total # of Vehicles 397 387 389 173 1346 Error # of Trucks 1a 7.69%b 3c 8.33% 1 20% 0 0 5 8.47% Total # of Vehicles 9 2.31% 9 2.38% 9 2.36% 3 1.76% 30 2.27% a absolute error, b relative percentage error, c one truck missed and two trucks double counted. Table 7-6: Error Causes for the Online Test on Southbound I-5 Near the NE 92nd Street Over-crossing Lane Error descriptions Explanations Lanes 1-4 25 cars missed Several lane-changing vehicles were missed at this location because they did not trigger any detectors. See Figure 7-9 for an example of such a vehicle. Our manual investigation also found that several vehicles were not detected when they passed over the virtual loops. This was probably because of...
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Related to ONLINE TEST

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