Photogrammetric Model and Technology Used in Road Traffic Accident Scene Measurement

In a newly developed system, a video camera is adopted as a road traffic accident scene data capturing and recording tool. The computer vision and photogrammetric principle and technologies are used. According to the analyses on relationship of a point in the world coordinate and its image in the lens coordinate, a fundamental photogrammetric model is deduced. The photogrammetric model is optimized and an efficient calculation algorithm is programmed to achieve high measurement accuracy. This technique presents an efficient non-destructive method for a wide range measurement. The main method to survey the road traffic accident scene is still with ruler and camera in the world nowadays. However, this method can't meet the need of modern survey condition, especially used in the highway accident measurement. In order to solve this problem, a new system is developed by the authors with the video camera as data capture tool. The photogrammetry and computer vision techniques are integrated in this system. The system can meet the requirement of the practical measurement, increase the data collection efficiency and decrease the accident processing time.