Vehicle positioning method and its system

摘要

A vehicle positioning method and its system are disclosed. The vehicle positioning method has a camera adapted to be mounted in front of a vehicle, multiple visible marks mounted in a photographing-available range of a camera, and a vehicle positioning system. Each visible mark contains a position information related to a location of the visible mark. The vehicle positioning system receives an image of the visible mark captured from the camera and image-processes the image to read the position information of the captured visible mark. The vehicle positioning system further calculates a distance between the captured visible mark and the vehicle and then further corrects the position information of the captured visible mark to have GPS coordinates of the vehicle.

主权项

1. A vehicle positioning method, comprising steps of:
(a) mounting multiple visible marks in a photographing-available range of a camera mounted in front of one vehicle, wherein each visible mark contains a position information related to a location of the visible mark; (b) capturing one of the visible marks; (c) image-processing the captured visible mark to read the position information thereof, and calculating a distance between the captured visible mark and the vehicle; (d) calculating GPS coordinates of the vehicle according to the position information of the captured visible mark and the distance; and
wherein, the distance includes a first distance D and a second distance E calculated by following equations:(1) D=√{square root over (HV×(f2/hv))} wherein “H” is a length of the visible mark, “V” is a width of the visible mark, “h” represents a length of the captured visible mark on the image, “v” represents a width of the captured visible mark on the image, and “f” represents an image distance; and (2) E=fD/e, wherein “E” represents a distance between the visible mark and a center of the vehicle, “e” represents a distance between the image and the center of the vehicle, and “f” represents the image distance.