基于近景摄影测量技术的汽车跑偏测试系统构建

通过建立近景摄影测量中的空间后方交会和空间前方交会数学模型,实现了相机的标定和车辆目标点由像点坐标到物理坐标的转换.利用LabVIEW视觉模块中自带的丰富的图像处理函数进行编程,以实时控制图像采集和处理,实现车辆目标点像点坐标的准确提取和像、物坐标的精确转换.最后根据汽车行驶跑偏的定义,计算跑偏方向、跑偏量和测试区车速等,并判断测试结果是否符合要求.

Vehicle-wandering testing system based on closerange photogrammetric technology

By establishing the mathematical models of spatial resection and intersection for close-range photogrammetry, the camera is calibrated and the image coordinate of vehicle-targeted points is converted into physical coordinate. Based on LabVIEWTM programming via image processing functions embedded in vision module, the real-time image sampling and processing are completed for correct vehicle-targeted point extraction and accurate image-physical coordinate conversion. According to the definition of vehicle wandering, the wandering direction, value and testing vehicle speed are calculated to judge the satisfaction of testing results.