Traffic accident detection device and method of detecting traffic accident
First 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.
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Accused Products
Abstract
The present invention provides a traffic accident detection device of detecting traffic accident that estimates a precise speed variation for a vehicle, and detects dangerous events similar to traffic accidents. A time series estimation unit (202) chronologically estimates a speed from a detected speed of a vehicle that a sensor unit (102) has detected, and acquires a first estimated value; and a reverse time series estimation unit (204) reverse chronologically estimates a speed from the detected speed, and acquires a second estimated value. An integration estimation unit (206) estimates the speed and the speed shift of the vehicle by defining the first estimated value as an integrated estimated value until a time when the distance between the first estimated value and the second estimated value is at maximum, and defining the second estimated value as the integrated estimated value at the time the distance is at maximum and thereafter.
6 Citations
9 Claims
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1. A traffic accident detection apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A traffic accident detection method, comprising the steps of:
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detecting a vehicle and obtaining speed observation values of the vehicle; computing 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, 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; extracting a time at which the difference between the time-series speed estimate values and the reverse-time-series speed estimate values becomes greatest; computing 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; computing acceleration values in a time-series fashion based on an amount of change in the speed estimate values per unit time; and comparing 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.
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Specification