Driving concentration level calculating apparatus and method, and system and method for warning of vehicle collision using the same

A driving concentration level calculating method, comprising:

• acquiring, by a controller, an acceleration of a traveling vehicle;
• measuring, by the controller, a relative velocity to a preceding vehicle periodically;
• removing, by the controller, noise from the acceleration of the traveling vehicle and noise from the relative velocity to a preceding vehicle;
• calculating, by the controller, correlation values based on the acceleration of the traveling vehicle and the relative velocity to the preceding vehicle from which noise has been removed;
• and
• detecting, by the controller, a time at which a maximum correlation value is calculated as a driving concentration level from among the calculated correlation values,
• wherein the calculating of the correlation values includes:
• setting, by the controller, a relative velocity window and an acceleration window for the relative velocity of the preceding vehicle and the acceleration of the traveling vehicle, respectively, wherein the relative velocity window and the acceleration window having substantially the same time range with respect to a current time point;
• and
• moving, by the controller, the relative velocity window in a past direction by unit time to calculate the correlation values sequentially, with the acceleration window fixed.

A system for warning of a vehicle collision based on a driving concentration level, comprising:

• a memory configured to store program instructions;
• and
• a processor configured to execute the program instructions, the program instructions when executed configured to:
• calculate a driving concentration level based on an acceleration of a traveling vehicle and a relative velocity to a preceding vehicle;
• calculate time to collision inverse (TTCi) using the relative velocity v and a relative distance d to the preceding vehicle;
• generate a warning signal when the calculated TTCi is equal to or greater than a first threshold value and the calculated driving concentration level is equal to or greater than a second threshold value;
• and
• output a warning sound based on the warning signal,
• wherein the program instructions when executed are further configured to:
• acquire an acceleration of the traveling vehicle;
• measure a relative velocity and a relative distance to a preceding vehicle;
• remove noise front the acquired acceleration of the traveling vehicle and remove noise from measured the relative velocity and the relative distance to the preceding vehicle;
• calculate correlation values based on the acceleration of the traveling vehicle and the relative velocity to the preceding vehicle from which noise has been removed;
• and
• detect a time at which a maximum correlation value is calculated as a driving concentration level from among the calculated correlation values.