作　　者： ; ; ; ; ; ; ; ;

机构地区： 天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室

出　　处： 《光电工程》 2006年第11期40-44,共5页

摘　　要： 根据基于面阵CCD摄像机成像测量的车辆前照灯配光性能测试系统的特点,提出一种成像测量与图像处理相结合的车辆前照灯配光屏幕照度测试靶标标定方法。该方法直接利用车辆前照灯配光性能成像测试系统对车辆前照灯配光屏幕上不同照度测试位置处分别放置的直线靶标进行成像,获取各直线靶标图像。在图像处理中,采用图像差分法及二值化方法提取各直线靶标,通过对各直线靶标的细化操作,获得各单直线图像,最后,采用本文提出的“粘贴”和“裁剪”方法将各单直线图像融合成一幅车辆前照灯配光屏幕照度测试位置靶标图像。该标定方法不仅能在车辆前照灯配光性能成像测量中使配光屏幕上的照度测试位置用照度测试位置靶标图像中对应的成像位置来定位,而且还能保持配光屏幕的均匀反射率特性。因此,该标定方法有利于实现配光屏幕上各处照度的同时成像测量。实验结果得出:文中标定系统的标定准确度为93.53%,符合车辆前照灯配光性能测试的要求。 According to the feature of matrix-CCD-camera based on photogrammetric system of photometric characteristics of vehicle headlamp, an approach to calibrate light-match screen for detection of photometric characteristics of vehicle headlamp combined with photogrammetry and image processing technology is firstly proposed, in which the photogrammetric system is directly used to capture images of the light-match screen against which a straight-line target is rested at different illuminance-detecting positions. During the image processing, these straight-line targets are extracted from these images using image subtraction and image binarization, and thinned as straight lines using thinning algorithm. Finally, these single straight-line images are merged as a illuminance-detecting position target image using the ＂paste＂ and ＂cut＂ algorithm proposed in the paper. The calibration approach is used not only to implement the maintenance of characteristics of homogeneous reflectance of light-match screen, but also to implement the location of illuminance-detecting positions on light-match screen with the corresponding imaging coordinates on the illuminance-detecting position target image during the photogrammetry of photometric characteristics of vehicle headlamp, and the calibration approach is advantageous to implementation of simultaneous photogrammetry of illuminance at each position on light-match screen. The experimental results show that the photogrammetry-based calibrating system meets the detection requirements of photometric characteristics of vehicle headlamp with the calibration accuracy of 93.53%.

关 键 词： 车辆前照灯 配光屏幕标定 标定准确度 成像测量 图像处理

领　　域： [自动化与计算机技术] [自动化与计算机技术]