Vehicle front scene watching using a signal camera for urban traffic

摘要

Major cause of car accidents are human error such as neglect of safety confirmation and the accidents occur on urban road. We propose a front-vehicle observation system for urban traffic. First, we calculate projective transformation (a vehicle's front image is changed into the image seen from right above) of the vehicle's front image acquired by a single camera placed on the dashboard of our vehicle. Next, the difference of two projective transformation images is calculated. Finally, if there are obstacles in observation-required area, we calculate the degree of crashing risks depending on the distance to the front vehicle and the speed of our vehicle, and a warning is given to the driver. This system mounted on our vehicle has been tested on urban traffic. As a result, the effectiveness of our method has been verified.