Vehicle detecting system
First Claim
1. A vehicle detecting system comprising, an optical array sensor which is disposed above a road surface to receive a one dimension light amount signal in the lane width direction from the road surface;
- an optical equipment which is mounted to said optical array sensor;
intermittent markings which are disposed at fixed intervals on the road surface in the one dimension field of view of said optical array sensor; and
a signal processing device which detects vehicles passing through on said road surface by processing an output signal sent from said optical array sensor;
wherein the intermittent period interval of said intermittent markings is longer than the on-road period interval of the picture elements of said optical array sensor, and shorter than the minimum width of the vehicle to be detected.
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Accused Products
Abstract
The object of the present invention is to accurately detect vehicles even under special conditions where vehicles go side by side, a motorcycle passes another vehicle in a traffic jam, or a shadow is cast on the road surface. The vehicle detecting system comprises a one dimension CCD camera 2 mounted above a road surface so as to provide one dimension light amount signal in the lane width direction from above the road surface and intermittent markings 6 disposed in the field of view of the one dimension CCD camera. When a vehicle 3 enters the field of view of the one dimension CCD camera 2, the modulation of one dimension light amount signal is disturbed. Therefore, a signal processing device 5 detects the vehicle on the basis of the output signal of the one dimension CCD camera 2 by checking the disturbance of modulation.
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Citations
6 Claims
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1. A vehicle detecting system comprising, an optical array sensor which is disposed above a road surface to receive a one dimension light amount signal in the lane width direction from the road surface;
- an optical equipment which is mounted to said optical array sensor;
intermittent markings which are disposed at fixed intervals on the road surface in the one dimension field of view of said optical array sensor; and
a signal processing device which detects vehicles passing through on said road surface by processing an output signal sent from said optical array sensor;wherein the intermittent period interval of said intermittent markings is longer than the on-road period interval of the picture elements of said optical array sensor, and shorter than the minimum width of the vehicle to be detected. - View Dependent Claims (2, 3)
- an optical equipment which is mounted to said optical array sensor;
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4. A vehicle detecting system comprising, a marking projecting device which includes a laser light source and a diffraction grating mounted above a road surface in order to project stripe-pattern intermittent marking images in the lane width direction onto the road surface;
- an optical array sensor which is mounted above the road surface so as to have an optical axis in a nonparallel arrangement with the optical axis of said marking projecting device, and receives a one dimension light amount signal of said intermittent marking images in the lane width direction from the road surface;
an optical equipment which is mounted to said optical array sensor; and
a signal processing device which detects vehicles passing through on said road surface by processing an output signal sent from said optical array sensor;wherein the intermittent period interval of said intermittent marking images is longer than the on-road period interval of the picture elements of said optical array sensor, and shorter than the minimum width of the vehicle to be detected. - View Dependent Claims (5, 6)
- an optical array sensor which is mounted above the road surface so as to have an optical axis in a nonparallel arrangement with the optical axis of said marking projecting device, and receives a one dimension light amount signal of said intermittent marking images in the lane width direction from the road surface;
Specification