Development of a System Measuring Vehicle Motions on Video Images

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This study develops the system of measuring vehicle motion on video images for the purpose of tracking vehicle trajectory. The video images are taken by the video camera being placed on an observation balloon, and covers about 200 meters' expressway section. After we established manual system of measuring, we developed automatic system of measuring and checked the system performance.In addition to usual observation index observed by traffic detectors such as traffic volume, density and velocity, this system enables to observe micro vehicle motions.The process of this system are consist of two parts as follows ;1.Image TransformationVideo Images are transformed to same coordinates as the standard image, by adjusting predetermined standard points.2.Vehicle RecognitionUsing transformed image each vehicles are recognized by comparing brightness with one of background.The system performance are checked by way of comparing performance of manual system with one of automatic system. In result, rate of vehicle recognition of automatic system is almost equal to one of manual system, however, accuracy of automatic system has some difference mainly caused by recognizing feeble reflective vehicle and tracks to one of manual system.