System for collection and transmission of road traffic information
First Claim
1. A system for the collection and transmission of traffic information, which comprises:
- a lens system disposed at a position at which said lens system is angled so as to include in the focal plane thereof a road area selected for the purpose of collection of traffic information,a plurality of photoelectric conversion elements arranged on said focal plane of said lens system along the direction of the image of the road area formed on said focal plane,a plurality of differential circuits for individually differentiating electric signals issuing from said plurality of photoelectric conversion elements, anda plurality of comparators for individually converting differentiated signals issuing from said plurality of differential circuits into pulse signals,wherein said plurality of photoelectric conversion elements arranged in the image of said road area formed on the focal plane are formed in shapes successively decreased in width and length in conformity with the perspective view of the traffic lane formed on said focal plane.
1 Assignment
0 Petitions
Accused Products
Abstract
The system for collection and transmission of road traffic information comprises a lens system installed on a tall structure such as on the roof of a building and angled vertically or diagonally to include in its field of view a road area subjected to observation and a plurality of photoelectric conversion elements disposed on the focal plane of the lens system along the image of the road area to be formed on the focal plane. The plurality of photoelectric conversion elements are formed in shapes successively decreased in width and length in conformity with the perspective view of the road area formed on the focal plane of the lens system. This system operates on the principle that when a vehicle enters the road area under observation by this system, it causes a change in the brightness of the image of the road area formed on the focal plane of the lens system, the changed brightness of the image induces a corresponding change in the outputs of the photoelectric conversion elements, and the resultant change in the outputs on being processed by scanning gives rise to a series of pulse signals, which are transmitted to a traffic control center.
44 Citations
5 Claims
-
1. A system for the collection and transmission of traffic information, which comprises:
-
a lens system disposed at a position at which said lens system is angled so as to include in the focal plane thereof a road area selected for the purpose of collection of traffic information, a plurality of photoelectric conversion elements arranged on said focal plane of said lens system along the direction of the image of the road area formed on said focal plane, a plurality of differential circuits for individually differentiating electric signals issuing from said plurality of photoelectric conversion elements, and a plurality of comparators for individually converting differentiated signals issuing from said plurality of differential circuits into pulse signals, wherein said plurality of photoelectric conversion elements arranged in the image of said road area formed on the focal plane are formed in shapes successively decreased in width and length in conformity with the perspective view of the traffic lane formed on said focal plane. - View Dependent Claims (2, 3, 4, 5)
-
Specification