Vehicle headlight state monitoring methods, systems and processor-readable media

• US 9,129,159 B2
• Filed: 06/05/2012
• Issued: 09/08/2015
• Est. Priority Date: 06/05/2012
• Status: Active Grant

• Current Assignee: Conduent Business Services, LLC (Conduent, Inc.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Cardoso, George Cunha, Pennington, Graham, Wang, Yao Rong
• Primary Examiner(s): Lee, Benjamin C
• Assistant Examiner(s): BLACK-CHILDRESS, RAJSHEED O
• Application Number:
  US13/488,549
• Publication Number:
  US 20130321142A1
• Time in Patent Office: 1,190 Days
• US Class Current: 1/1
• CPC Class Codes: B60Q 1/509 specific to unauthorised use, e.g. for indicating stolen vehicles or infringements of traffic rules
• CPC Class Codes: B60Q 2300/41 preceding vehicle
• CPC Class Codes: B60Q 2300/42 oncoming vehicle
• CPC Class Codes: G01M 17/007 Wheeled or endless-tracked vehicles G01M17/08 takes precedence
• CPC Class Codes: G06V 20/54 of traffic, e.g. cars on the road, trains or boats
• CPC Class Codes: G06V 20/584 of vehicle lights or traffic lights

Abstract

A video-based vehicle headlight state monitoring method and system. A vehicle image can be captured by an image-capturing unit and converted to a grayscale image. The grayscale image can be processed to locate a front license plate and identify a position of a headlight region in front of the vehicle utilizing an algorithm. An average digital count with respect to brightness of the headlight region can be compared with average digital count with respect to brightness of several parts of the vehicle and a background region to determine the vehicle headlights ON/OFF status. The headlights can be considered ON if the digital count level of the headlight region is higher than the digital count of the several parts of the vehicle and the background region. A warning signal can be initiated to turn the headlights on during a special situation utilizing a signal generator.

Claims

1. A method for monitoring usage of headlights of a vehicle, said method comprising:

converting an image of a vehicle into a grayscale age via a gray scale converting unit;

processing said grayscale image via an image-processing unit and a headlight region identifying unit to locate a front license plate of said vehicle to identify an area of said vehicle where said headlights are most likely to be located, said headlight region identifying unit comprising said gray scale converting unit; and

comparing an average digital count with respect to a brightness of said headlight region to an average digital count with respect to a brightness of a plurality of parts of said vehicle and a background region to determine an ON status and an OFF status of the headlights associated with said vehicle.

2. The method of claim 1 further comprising considering said headlights as ON if said digital count level of said headlight region is higher than said digital count of said plurality of parts of said vehicle and said background region.

3. The method of claim 2 further comprising considering said headlights as OFF if said digital count level of said headlight region is lower than said digital count of said plurality of parts of said vehicle and said background region.

4. The method of claim 2 further comprising initiating a warning signal to turn said headlights ON during a special situation utilizing a warning signal generator to facilitate law enforcement.

5. The method of claim 4 further comprising determining a position of said headlight region utilizing a location of said front license plate wherein said headlights are located inside an area near said front license plate.

6. The method of claim 4 further comprising reminding a driver to turn on said headlights by flashing a sign on a road.

7. The method of claim 6 further comprising:

verifying said vehicle image to automatically flag a non-compliant vehicle to facilitate law enforcement; and

reviewing said vehicle image of said non-compliant vehicle to ensure that a violation thereof is genuine.

8. A system for monitoring usage of headlights of a vehicle, said system comprising:

a processor;

a data bus coupled to said processor; and

a non-transitory computer-usable medium embodying computer program code, said computer-usable medium being coupled to said data bus, said computer program code comprising instructions executable by said processor and configured for;

converting an image of a vehicle into a grayscale image via a gray scale converting unit;

processing said grayscale image via an image-processing unit and a headlight region identifying unit to locate a front license plate of said vehicle to identify an area of said vehicle where said headlights are most likely to be located, said headlight region identifying unit comprising said gray scale converting unit; and

comparing an average digital count with respect to a brightness of said headlight region to an average digital count with respect to a brightness of a plurality of parts of said vehicle and a background region to determine an ON status and an OFF status of the headlights associated with said vehicle.

9. The system of claim 8 wherein said instructions are further configured for considering said headlights as ON if said digital count level of said headlight region is higher than said digital count of said plurality of parts of said vehicle and said background region.

10. The system of claim 9 wherein said instructions are further configured for considering said headlights as OFF if said digital count level of said headlight region is lower than said digital count of said plurality of parts of said vehicle and said background region.

11. The system of claim 9 wherein said instructions are further configured for initiating a warning signal to turn said headlights ON during a special situation utilizing a signal generator to facilitate law enforcement.

12. The system of claim 11 wherein said instructions are further configured for determining a position of said headlight region utilizing location of said front license plate wherein said headlights are located inside an area near said front license plate.

13. The system of claim 11 wherein said instructions are further configured for reminding a driver to turn on said headlights by flashing a sign on a road.

14. The system of claim 12 wherein said instructions are further configured for:

verifying said vehicle image to automatically flag a non-compliant vehicle to facilitate law enforcement; and

reviewing said vehicle image of said non-compliant vehicle to ensure that a violation thereof is genuine.

15. A non-transitory processor-readable medium storing code representing instructions to cause a process for monitoring usage of headlights of a vehicle, said code comprising code to:

convert an image of a vehicle into a grayscale image via a gray scale converting unit;

process said grayscale image via an image-processing unit and a headlight region identifying unit to locate a front license plate of said vehicle to identify an area of said vehicle where said headlights are most likely to be located, said headlight region identifying unit comprising said gray scale converting unit; and

compare an average digital count with respect to a brightness of said headlight region to an average digital count with respect to a brightness of a plurality of parts of said vehicle and a background region to determine an ON status and an OFF status of the headlights associated with said vehicle.

16. The processor-readable medium of claim 15 wherein said code further comprises code to consider said headlights as ON if said digital count level of said headlight region is higher than said digital count of said plurality of parts of said vehicle and said background region.

17. The processor-readable medium of claim 16 wherein said code further comprises code to consider said headlights as OFF if said digital count level of said headlight region is lower than said digital count of said plurality of parts of said vehicle and said background region.

18. The processor-readable medium of claim 17 wherein said code further comprises code to initiate a warning signal to turn said headlights ON during a special situation utilizing a signal generator to facilitate law enforcement.

19. The processor-readable medium of claim 17 wherein said code further comprises code to determine a position of said headlight region utilizing location of said front license plate wherein said headlights are located inside an area near said front license plate.

20. The processor-readable medium of claim 19 wherein said code further comprises code to remind a driver to turn on said headlights by flashing a sign on a road.