Night detection of parked vehicles
To detect parked vehicles at night, the present invention discloses night-detection device and method. The night-detection device comprises a moving-vehicle sensor and a parked-vehicle sensor. It uses the light beam from a passing-by vehicle to detect parked vehicles.
1. A night-detection device for parked vehicles, comprising:
a parked-vehicle sensor for determining whether a parking space in a parking area is occupied by a parked vehicle; and
a moving-vehicle sensor for sensing a moving vehicle within a pre-determined range of said parking area;
wherein said parked-vehicle sensor captures at least an image of said parking area when said moving-vehicle sensor detects said moving vehicle.
2. The system according to claim 1 , wherein said moving-vehicle sensor is an audio sensor, an optical sensor, or an electromagnetic sensor.
3. The system according to claim 1 , wherein said moving-vehicle sensor is located at the same location as said parked-vehicle sensor.
4. The system according to claim 1 , wherein said moving-vehicle sensor is located at a different location from said parked-vehicle sensor.
5. The system according to claim 4 , wherein said moving-vehicle sensor communicates with said parked-vehicle sensor using a wireless means.
6. The system according to claim 1 , wherein said parked-vehicle sensor comprises an optical detector, a processor and a memory.
7. The system according to claim 6 , wherein said optical detector comprises at least a camera.
8. The system according to claim 7 , wherein said camera captures images of said parking area more frequently at night than during the day.
9. The system according to claim 6 , wherein said memory stores a parked vehicle detection algorithm.
10. The system according to claim 6 , wherein said memory stores a passing-by vehicle detection algorithm.