The invention discloses a subway train auxiliary positioning method and system based on image retrieval, and the method comprises the steps: pre-building an image position calibration database which represents the mapping relation between an image and a position, carrying out the feature vector extraction of a train operation image obtained in real time on this basis, and carrying out the feature vector extraction; and searching a similar image matched with the train operation image in a database based on the feature vector, then obtaining calibration position data corresponding to the similar image according to the mapping relation, and filtering the calibration position data to obtain optimal position data as train position data. Due to the fact that a large number of mapping relations between any position and the image are stored in the image position calibration database, absolute positioning of the train can be achieved by retrieving and matching the most similar image based on the mapping relations, filtering optimization is adopted to enable the train positioning result to have good stability, and the influence of position jumping caused by single-point matching is basically eliminated.
本发明公开了一种基于图像检索的地铁列车辅助定位方法及系统,包括:预先建立表征图像与位置映射关系的图像位置标定数据库,在此基础上,对实时获得的列车运行图像进行特征向量提取,基于特征向量在数据库中搜索与列车运行图像匹配的相似图像,然后依据映射关系获得相似图像对应的标定位置数据后,对标定位置数据进行滤波处理得到最优位置数据作为列车位置数据。由于图像位置标定数据库保存了大量的任意位置与图像的映射关系,基于该映射关系通过检索匹配最相似图像能够实现列车绝对定位,采用滤波优化使得列车定位结果具有较好的稳定性,基本消除了单点匹配造成的位置跳动的影响。
Subway train auxiliary positioning method and system based on image retrieval
一种基于图像检索的地铁列车辅助定位方法及系统
2023-09-15
Patent
Electronic Resource
Chinese
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