GPS CORRECTION SYSTEM AND METHOD USING IMAGE RECOGNITION INFORMATION

• US 20140032100A1
• Filed: 09/06/2012
• Published: 01/30/2014
• Est. Priority Date: 07/24/2012
• Status: Active Grant

• Current Assignee: PLK Technologies Co., Ltd.
• Original Assignee: PLK Technologies Co., Ltd.
• Inventors: Park, Kwang Il, Kim, Jin Hyuck, Lim, Sang Mook
• Granted Patent: US 9,109,907 B2
• Time in Patent Office: Days
• US Class Current: 701/446
• CPC Class Codes: B60W 2420/403 Image sensing, e.g. optical camera
• CPC Class Codes: G01C 21/005 with correlation of navigation data from several sources, e.g. map or contour matching G01C21/30 takes precedence
• CPC Class Codes: G01C 21/30 Map- or contour-matching
• CPC Class Codes: G05D 1/0246 using a video camera in combination with image processing means
• CPC Class Codes: G06V 20/56 exterior to a vehicle by using sensors mounted on the vehicle
• CPC Class Codes: G06V 20/588 Recognition of the road, e.g. of lane markings; Recognition of the vehicle driving pattern in relation to the road

Abstract

Provided is a GPS correction system and method which corrects position information obtained from a low-precision GPS device using image recognition information. The GPS correction system using image recognition system includes: a GPS module; an image recognition device having a line recognition function; a road map storage unit configured to store road map information including line characteristic information or a road map receiving unit configured to receive the road map information; and an information processing device configured to compare the line recognition information acquired through the image recognition device to the line characteristic information, correct a current position measured by the GPS module, and calculate traveling lane information.

Claims

1. A GPS correction system using image recognition system, comprising:

a GPS module;

an image recognition device having a line recognition function;

a road map storage unit configured to store road map information including line characteristic information or a road map receiving unit configured to receive the road map information; and

an information processing device configured to compare the line recognition information acquired through the image recognition device to the line characteristic information, correct a current position measured by the GPS module, and calculate traveling lane information.

2. The GPS correction system of claim 1, wherein the information processing device comprises:

an information matching unit configured to match the line recognition information to the line characteristic information and calculate a traveling lane; and

a lane change tracing unit configured to calculate the traveling lane by tracing a lane change record of a vehicle in a state where the traveling lane cannot be calculated by the information matching unit.

3. The GPS correction system of claim 2, wherein the information processing device further comprises a lateral position correction unit configured to calculate an offset for a left line of the current traveling lane from the image recognition information and correct a lateral position.

4. The GPS correction system of claim 3, wherein the lateral position correction unit adds the offset and the sum of widths of left lines, included in the line characteristic information, in order to correct the lateral position.

5. The GPS correction system of claim 1, wherein the information processing device further comprises a longitudinal position estimation unit configured to calculate a head angle between a line and a traveling direction of the vehicle from the image recognition information and estimate a longitudinal position, when a signal received by the GPS module is cut.

6. The GPS correction system of claim 5, wherein the longitudinal position estimation unit estimates the longitudinal position through the following equation:

LP=Δ

t×

v×

cos θ

where LP represents a longitudinal position of the vehicle, Δ

t represents a time variation, v represents a velocity of the vehicle, and θ

represents the head angle between the line and the traveling direction of the vehicle.

10. The GPS correction system of claim 2, wherein the information processing device further comprises a longitudinal position estimation unit configured to calculate a head angle between a line and a traveling direction of the vehicle from the image recognition information and estimate a longitudinal position, when a signal received by the GPS module is cut.

11. The GPS correction system of claim 3, wherein the information processing device further comprises a longitudinal position estimation unit configured to calculate a head angle between a line and a traveling direction of the vehicle from the image recognition information and estimate a longitudinal position, when a signal received by the GPS module is cut.

12. The GPS correction system of claim 4, wherein the information processing device further comprises a longitudinal position estimation unit configured to calculate a head angle between a line and a traveling direction of the vehicle from the image recognition information and estimate a longitudinal position, when a signal received by the GPS module is cut.

7. A GPS correction method using image recognition information, comprising the steps of:

(a) matching line recognition information acquired through an image recognition device to line characteristic information of road map information and calculating a traveling lane;

(b) correcting the traveling lane by tracing a lane change record of a vehicle, when the traveling lane is not specified at the step (b);

(c) correcting a lateral position by calculating an offset for a left line of the current traveling lane from the image recognition information of the image recognition device; and

(d) estimating a longitudinal position by calculating a head angle between a line and a traveling direction of the vehicle from the image recognition information, when a signal received by a GPS module is cut.

8. The GPS correction method of claim 7, wherein the step (c) comprises correcting the lateral position by adding the offset and the sum of widths of left lanes included in the line characteristic information.

9. The GPS correction method of claim 7, wherein the step (d) comprises estimating the longitudinal position through the following equation:

LP=Δ

t×

v×

cos θ

where LP represents a longitudinal position of the vehicle, Δ

t represents a time variation, v represents a velocity of the vehicle, and θ

represents the head angle between the line and the traveling direction of the vehicle.

13. The GPS correction method of claim 8, wherein the step (d) comprises estimating the longitudinal position through the following equation:

LP=Δ

t×

v×

cos θ

where LP represents a longitudinal position of the vehicle, Δ

t represents a time variation, v represents a velocity of the vehicle, and θ

represents the head angle between the line and the traveling direction of the vehicle.