Auto-Tracking by Template Switching Method

摘要

It is important to get the information about a position and orientation of target vehicle for traffic safety. These parameters were obtained by laser in conventional methods, but this method costs a fortune, and is not flexible since target vehicle should be equipped with special reflex mirror in advance. This report suggests a method that tracks a feature of the target vehicle consecutively in order to measure the position and orientation of target vehicle only with cameras without mounting anything on target vehicle. This method takes advantage of a license plate on target vehicle of which size, characters size and interval are standardized. It can be tracked by correlation continuously with switching a template image to the part image selected in the last image, but the differences between their images occur. To correct these differences, this system makes use of the characters on the license plate. These characters are extracted by image processing like binary, labeling, and so on. And we also measured the position and orientation of target vehicle. The effectiveness of this system was shown by the experimental results.