Intraframe Scene Capturing and Speed Measurement Based on Superimposed Image: New Sensor Concept for Vehicle Speed Measurement

Figure 9

Error of the estimated trace length compared to the ground truth obtained through stereo correspondence, with respect to estimated trace length. Notice the decreasing tendency with the estimated length. As the trace length becomes longer, the uncertainty caused by the light source localization becomes less significant compared to the total trace length. There is another interesting feature: different error values can be observed for samples with similar trace length. This is caused by the differences in headlight geometries of different vehicles, because the position of the light source inside the headlight varies with different car types.