Patent ID: 9704391
Date: 2017-07-11
CPC Classifications: G07C,G08G

Claim:
1. A traffic accident detection apparatus comprising: a sensor section that detects a vehicle and obtains speed observation values of the vehicle; a time-series/reverse-time-series combined estimation section that computes time-series speed estimate values estimated by reading out the speed observation values in a time-series fashion and applying a predetermined filter to the speed observation values read in a time-series fashion, computes reverse-time-series speed estimate values estimated by reading out the speed observation values in a reverse-time-series fashion and applying the predetermined filter to the speed observation values in a reverse-time-series fashion, extracts a time at which the difference between the time-series speed estimate values and the reverse-time-series speed estimate values becomes greatest, and computes speed estimate values by connecting the time-series speed estimate values preceding the extracted time and the reverse-time-series speed estimate values following the extracted time at the extracted time; an acceleration computation section that computes acceleration values in a time-series fashion based on an amount of change in the speed estimate values per unit time; and a sudden braking determination section that compares the acceleration values and a pre-defined determination threshold in a time-series fashion, and determines a time at which the acceleration values are less than the determination threshold to be a sudden braking time of the vehicle.