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US4433325A
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Optical vehicle detection system
Assignee: Omron Corp
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Filing: 1981-09-29
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Granted: 1984-02-21
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Expires: 2001-09-29
Abstract
Abstract An optical vehicle detection system comprising camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal, inquiring means for inquiring if the output video signal includes a predetermined shadow signal component, and processing means associated with the inquiring means, if the output video signal includes the predetermined shadow signal component, for processing the output video signal as a signal having a component of shadow cast by a vehicle.
Inventors
- 👤 Ryohei Tanaka
- 👤 Akinobu Kitamura
- 👤 Takaaki Odake
- 👤 Yutaka Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:24
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
An optical vehicle detection system comprising: camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal, inquiring means for inquiring if said output video signal includes a predetermined vehicle shadow signal component, and processing means associated with said inquiring means, for processing said output video signal as a signal having a component of shadow cast by a vehicle, when said output video signal includes the predetermined shadow signal component.
Claim 2
Dependent Claim
80 words
An optical vehicle detection system comprising: camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal, inquiring means for inquiring if said output video signal includes a predetermined vehicle shadow signal component, and processing means associated with said inquiring means, for processing said output video signal as a signal having a component of shadow cast by a vehicle, when said output video signal includes the predetermined shadow signal component.
Claim 3
Dependent Claim
27 words
A system according to claim 1 in which said predetermined shadow signal component is a wave decreasing at the beginning thereof from a predetermined road surface level.
Claim 4
Dependent Claim
33 words
A system according to claim 1 in which said predetermined shadow signal component is one of predetermined signal wave form patterns representing shadow cast by a vehicle running in a neighboring roadway lane.
Claim 5
Dependent Claim
28 words
A system according to claim 1 further including means for confirming if said output video signal including the predetermined shadow signal component exceeds a predetermined vehicle confirmation level.
Claim 6
Dependent Claim
144 words
An optical vehicle detection system comprising: camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal; inquiring means for inquiring if said output video signal includes a predetermined vehicle shadow signal component, said inquiring means comprising; sampling means for sampling said output video signal every sampling cycle so as to generate a current data, comparing means for comparing a reference deviation with a deviation obtained by subtracting a previous processed data from said generated current data, detecting means for detecting a wave form pattern of said output video signal as to increment, decrement and constant states; and processing means associated with said inquiring means, for processing said output video signal as a signal having a component of shadow cast by a vehicle when said output video signal includes the predetermined shadow signal component.
Claim 7
Dependent Claim
144 words
An optical vehicle detection system comprising: camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal; inquiring means for inquiring if said output video signal includes a predetermined vehicle shadow signal component, said inquiring means comprising; sampling means for sampling said output video signal every sampling cycle so as to generate a current data, comparing means for comparing a reference deviation with a deviation obtained by subtracting a previous processed data from said generated current data, detecting means for detecting a wave form pattern of said output video signal as to increment, decrement and constant states; and processing means associated with said inquiring means, for processing said output video signal as a signal having a component of shadow cast by a vehicle when said output video signal includes the predetermined shadow signal component.
Claim 8
Dependent Claim
131 words
An optical vehicle detection system comprising: camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal, inquiring means for inquiring if said output video signal includes a predetermined vehicle shadow signal component, and processing means associated with said inquiring means, for processing said output video signal as a signal having a component of shadow cast by a vehicle when said output video signal includes the predetermined shadow signal component, and said processing means having means for memorizing said output video signal which includes a predetermined vehicle shadow component and having means for detecting as a detection time a time difference between the time points when a set signal and reset signal are respectfully generated as vehicle crosses a road surface.
Claim 9
Dependent Claim
131 words
An optical vehicle detection system comprising: camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal, inquiring means for inquiring if said output video signal includes a predetermined vehicle shadow signal component, and processing means associated with said inquiring means, for processing said output video signal as a signal having a component of shadow cast by a vehicle when said output video signal includes the predetermined shadow signal component, and said processing means having means for memorizing said output video signal which includes a predetermined vehicle shadow component and having means for detecting as a detection time a time difference between the time points when a set signal and reset signal are respectfully generated as vehicle crosses a road surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |