Closure To 'video-capture-basedapproach To Extract Multiple Vehicularrntrajectory Data For Traffic Modeling'rnby Heng Wei, Chuen Feng, Eric Meyer,rnand Joe Lee

摘要

Alfredo Garcia and Mario Romero have proposed a homologic transformation method in their comments to model the algorithm for extraction of vehicle trajectory data using four reference points that are measured in the field. Theoretically, this new approach is capable of better improving the accuracy of the trajectory data. Reducing the numbers of the field reference points by this method sounds exciting. Additionally, it becomes easier to obtain the horizontal and vertical distances between the vehicle and the origin point simultaneously, i.e., X and Y, as shown in Fig. 1. However, one minor problem has been identified: L2 in Fig. 2 should be an extended line with L1 from the vanishing point V2 and P, rather than a parallel line to BL2. Similarly, line L7 is an extension of line L6 from the vanishing point V2 connecting P5 and P6. This is proved as follows.