Assisting the driving of an automotive vehicle when approaching a speed breaker
A driving assistance method for a motor vehicle ( 1 ) when approaching a speed bump comprises, according to the invention: detecting and tracking at least one other moving vehicle ( 4 1 ) in front of the motor vehicle ( 1 ) based on processing images captured by a camera ( 10 ) on board the motor vehicle ( 1 ); establishing a temporal profile of the estimated distance between the motor vehicle ( 1 ) and the at least one detected and followed other moving vehicle ( 4 1 ); detecting an anomaly area in the temporal profile; and estimating a distance d bump between the motor vehicle ( 1 ) and a speed bump ( 3 ) on the basis of the estimated distance between the motor vehicle ( 1 ) and the at least one other vehicle ( 4 1 ) at a time separate from the times corresponding to the detected anomaly area.
1. A driving assistance method for a motor vehicle when approaching a speed bump, comprising:
detecting and tracking at least one other moving vehicle in front of the motor vehicle based on processing images captured by a camera on board said motor vehicle;
establishing a temporal profile of the estimated distance between said motor vehicle and said at least one detected and followed other moving vehicle;
detecting an anomaly area in said temporal profile; and
estimating a distance d bump between said motor vehicle and a speed bump on the basis of a distance between the motor vehicle and said at least one other vehicle, estimated at a time t bump separate from the times corresponding to the detected anomaly area.
2. The method as claimed in claim 1 , wherein the distance d bump is estimated using the relationship
d bump =D ( t bump )− d parc
wherein D(t bump ) is the distance between the motor vehicle and said at least one other vehicle estimated at said time t bump , and d parc corresponds to the distance covered by the motor vehicle starting from said time t bump .
3. The method as claimed in claim 2 , wherein the detection and tracking step comprises detecting and tracking at least one other vehicle traveling in the same direction as said motor vehicle, and wherein said time t bump is chosen before a time corresponding to the start of the detected anomaly area.
4. The method as claimed in claim 2 , wherein the detection and tracking step comprises detecting and tracking at least one other vehicle traveling in the opposite direction to said motor vehicle, and wherein said time t bump is chosen after a time corresponding to the end of the detected anomaly area.
5. The method as claimed in claim 1 , further comprising: correcting a position of said motor vehicle with respect to a high-definition geographical map on board said motor vehicle on the basis of a position of a marker corresponding to said speed bump and pre-recorded in said map, and of the estimated distance d bump .
6. The method as claimed in claim 5 , wherein an elevational movement of said motor vehicle is estimated on the basis of an inertial sensor on board said motor vehicle.
7. The method as claimed in claim 5 , wherein an elevational movement of said motor vehicle is estimated on the basis of analyzing optical flows over a plurality of successive image portions captured by said on-board camera.
8. The method as claimed in claim 1 , further comprising: estimating an elevational movement of said motor vehicle, and wherein said distance d bump is estimated only if no elevational movement greater than a predefined threshold and concomitant with a time corresponding to the detected anomaly area is estimated.
9. A driving assistance system for a motor vehicle when approaching a speed bump, comprising an on-board processing module configured to perform the method as claimed in claim 1 .