关键词: （R－G）色差特征, 灯识别, 车辆识别, 行车安全预警系统

Abstract: Fast and accurate vehicle identification is the key technology of safety early warning system for driving at night. The paper proposes a real-time vehicle identification method based on image of night taillights in the RGB color space. For analyzing and extracting color characteristics of taillights, the chromatic aberration characteristics of （R－G） image are selected as the input of image segmentation, for which the adaptive threshold algorithm is used. Solving the problem of taillights adhesions at nighttime, the adjoined taillights are cut apart by setting the judgment condition of adjoined taillights, which is inspired by the non-maximum suppression algorithm. According to the similar characteristics of the left and right taillight on a car, the taillights are paired by defining the rules of taillights pairing and the difference degree of taillights. And the overlapping image of vehicle is handled by defining vehicle bounding box and setting the maximum overlapping rate. The experimental results show that the method has small amount of calculation, average time-consuming per frame is about 26 ms, and the accuracy rate of vehicle identification is more than 93% under a mixed scenes containing taillights adhesion and overlapped vehicles.

Key words: color aberration characteristics of （R－G） image, taillights identification, vehicle identification, early warning system for driving security