Traffic light and traffic light color identification system, and methods thereof
Traffic light and traffic light color identification system, and methods thereof are provided. A traffic light includes a control unit, configured to generate a control command; a signal modulating unit, configured to modulate an electrical signal based on the control command and output a modulation signal having a modulation frequency corresponding to a color of a signal light of the traffic light; and a signal generating unit configured to control the signal light of the traffic light and to transfer a signal to a vehicle, based on the modulation signal.
1. A method, comprising:
generating a control command;
modulating an electrical signal based on the control command to provide a modulation signal;
outputting the modulation signal having a modulation frequency corresponding to a color of a signal light of the traffic light;
modulating a current intensity of the signal light such that a lowest current intensity is greater than 0, wherein the lowest current intensity is about ⅓ to about ½ of a highest current intensity of the signal light; and
controlling the signal light to transfer a signal based on the modulation signal and receivable by a vehicle.
2. The method according to claim 1 , wherein the signal transferred to the vehicle is a light signal including a visible light signal.
3. A method, comprising:
generating a control command;
modulating an electrical signal based on the control command to provide a modulation signal;
outputting the modulation signal having a modulation frequency corresponding to a color of a signal light of the traffic light; and
controlling the signal light to transfer a signal based on the modulation signal and receivable by a vehicle,
wherein the signal light emits at a negative angle downwards to a ground and with respect to a horizontal direction, and an absolute value of the negative angle is greater than or equal to about 5° and smaller than or equal to about 10°.
4. A method, comprising:
generating a control command;
modulating an electrical signal based on the control command to provide a modulation signal;
outputting the modulation signal having a modulation frequency corresponding to a color of a signal light of the traffic light;
controlling the signal light to transfer a signal based on the modulation signal and receivable by a vehicle,
collecting the signal light;
converting the signal light to the electrical signal;
obtaining the modulation frequency of the electrical signal; and
determining the color of the signal light based on the modulation frequency of the electrical signal.