Video traffic monitoring and signaling apparatus

• US 8,018,352 B2
• Filed: 03/27/2007
• Issued: 09/13/2011
• Est. Priority Date: 03/27/2006
• Status: Active Grant

• Current Assignee: Cognex Corporation
• Original Assignee: Cognex Corporation
• Inventors: Shillman, Robert, Schatz, David
• Primary Examiner(s): Bugg; George
• Assistant Examiner(s): Yacob; Sisay
• Application Number:
  US11/728,858
• Publication Number:
  US 20080088478A1
• Time in Patent Office: 1,631 Days
• Field of Search: 340/937, 340/935, 340/934, 340/917, 340/910, 340/906, 340/907, 340/534, 340/310.11, 340/933, 348/149, 348/E7.086, 701/117, 362/545, 362/800, 362/240, 362/236, 307/3, 382/104, 382/100
• US Class Current: 340/937
• CPC Class Codes: G08G 1/0175 by photographing vehicles, e.g. when violating traffic rules
• CPC Class Codes: G08G 1/08 according to detected number or speed of vehicles
• CPC Class Codes: G08G 1/095 Traffic lights
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A traffic signal head having a signal lamp or signal ball with an embedded video monitoring system can be provided to perform vehicle detection to inform an intelligent traffic control system. Video monitoring of traffic lanes facing the signal head can be analyzed by such a system to emulate inductive loop signals that are input signals to traffic control systems.

Claims

1. A system for traffic monitoring and signaling, wherein a conventional signal lamp includes a housing and a light source located within a space formed by the housing, the system comprising:

a traffic signal head having at least one lamps receiving space that is open to one side, the lamp receiving space configured to receive a conventional signal lamp; and

a signal lamp comprising a video traffic monitoring system and a light source, the video traffic monitoring system comprising an image sensor configured to provide an image of one or more traffic lanes facing the signal head; and

wherein the signal lamp including the video traffic monitoring system is received within the lamps space.

2. The system of claim 1 wherein the video traffic monitoring system further comprises a lens operatively interconnected with the image sensor, the lens having optical parameters to enable the image sensor to capture an image of a vehicle license plate.

3. The system of claim 1 wherein the video traffic monitoring system further comprises of an image processor configured to perform image analysis.

4. The system of claim 1 further comprising a communications module configured to transmit information from the video traffic monitoring system to a control module.

5. The system of claim 4 wherein the information comprises an indicator of whether a vehicle is present in one or more of the one or more traffic lanes.

6. The system of claim 5 wherein the indicator is identical to a signal output by an inductive loop detector.

7. The system of claim 4 wherein the information is transmitted using a signal overlaid onto a power line to the signal lamps.

8. The system of claim 4 wherein the information is transmitted using frequency shift keying modulation.

9. The system of claim 4 wherein the information is transmitted using frequency modulation radio signals.

10. The system of claim 4 wherein the system includes more than one signal lamp and wherein the control module is configured to, in response to receipt of information from the video traffic monitoring system, activate one of the one or more lamps.

11. The system of claim 1 wherein the video traffic monitoring system is further configured to detect emergency strobe lights.

12. The system of claim 11 wherein the image sensor is further configured to differentiate among differing colors of emergency strobe lights.

13. The system of claim 1 wherein the video traffic monitoring system is further configured to retain one or more images of one or more of the one or more traffic lanes.

14. The system of claim 13 wherein the one or more images are stored in a central server.

15. The system of claim 1 wherein the signal lamp incorporating the video traffic monitoring system ace is mechanically swappable with conventional traffic signal lamps.

16. The system of claim 1 wherein the lamp that includes the video traffic monitoring system includes a lamp lens that substantially closes the open side of the lamp receiving space, the image sensor arranged to obtain images through the lamp lens.

17. The system of claim 16 wherein the lamp lens includes a second lens incorporated therein, the second lens operatively aligned with the image sensor and having optical parameters to enable the image sensor to capture an image of a vehicle license plate.

18. The system of claim 1 wherein the signal lamp further comprises a lamp housing forming a housing space and wherein the video traffic monitoring system and light source are located within the housing space.

19. The system of claim 1 wherein the traffic signal head wherein the lamp receiving space is a first lamp receiving space and the traffic signal head further includes a second lamp receiving space substantially similar to the first lamp receiving space and the system includes a conventional signal lamp that includes a light source located within a lamp housing wherein the lamp housing is received within the second lamp receiving space.

20. The system of claim 1 wherein the signal lamp including the video traffic monitoring system includes a lamp housing that is substantially similar to the housing of a conventional signal lamp.

23. The system of claim 16 wherein the lamp lens includes a second lens incorporated therein, the second lens operatively aligned with the image sensor and having optical parameters to enable the image sensor to capture the image of one or more traffic lanes facing the signal head through the second lens.

24. The system of claim 23 further comprising a second light source, the second light source configured to project illumination onto the second lens so as to illuminate the second lens.

25. The system of claim 1 further comprising a power supply, the power supply configured to provide power to the video traffic monitoring system when the light source is not energized.

21. A system for traffic monitoring and signaling, the system comprising:

a traffic signal head having at least first and second substantially similar lamp receiving spaces that are each open to one side;

a first signal lamp comprising a first housing, a first lens, a video traffic monitoring system and a first light source, the video traffic monitoring system comprising an image sensor configured to provide an image of one or more traffic lanes facing the signal head, the first light source and video traffic monitoring system located within a space defined by the first housing and the first lens;

a conventional signal lamp comprising a second housing, a second lens and a second light source wherein the second light source is located within a space defined by the second housing and the second lens;

wherein each of the first and second housings includes an external surface and each of the external surfaces is substantially identical and each housing is received in one of the first and second lamp receiving spaces with the lenses substantially closing the lamp receiving space openings.

22. A system for traffic monitoring and signaling, the system comprising:

a traffic signal head having first, second and third substantially similar lamp receiving spaces that are each open to one side;

first, second and third signal lamps receives within the first, second and third lamp receiving spaces, each signal lamp including a light source located within a housing wherein each of the housings includes an external surface and each of the external surfaces is substantially identical; and

a video traffic monitoring system located within one of the signal lamp housings, the video traffic monitoring system comprising an image sensor configured to provide an image of one or more traffic lanes facing the signal head.

26. A system for traffic monitoring and signaling, wherein a traffic signal head includes at least one lamp receiving space that is open to one side, the lamp receiving space configured to receive a conventional signal lamp, the conventional signal lamp including a housing and a light source located within a space formed by the housing, the system comprising:

a signal lamp comprising a video traffic monitoring system and a light source, the video traffic monitoring system comprising an image sensor configured to provide an image of one or more traffic lanes facing the signal head;

a signal lamp housing including an open side, the video traffic monitoring system and the light source being positioned within the signal lamp housing;

a lamp lens that substantially closes the open side of the signal lamp housing, the image sensor arranged to obtain the image of the one or more traffic lanes through the lamp lens; and

wherein the signal lamp housing, including the video traffic monitoring system and the light source, is mechanically swappable with the conventional signal lamp.

27. A method for traffic monitoring, wherein a conventional signal lamp includes a housing and a light source located within a signal lamp space in a traffic signal head, the method comprising:

providing a signal lamp comprising a video traffic monitoring system and a light source, the video traffic monitoring system comprising an image sensor configured to provide an image of one or more traffic lanes facing the signal head, the signal lamp including the video traffic monitoring system and the light source configured to be received within the space configured for the conventional signal lamp;

detecting, by the image sensor, one or more vehicles in one or more lanes facing the traffic signal head; and

transmitting an indicator of whether a vehicle is present in the one or more lanes.