VEHICLE POSITION DETECTION SYSTEM

• US 20110243379A1
• Filed: 01/25/2011
• Published: 10/06/2011
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: MORITA, Yuusuke, MIYAJIMA, Takayuki
• Granted Patent: US 8,630,461 B2
• Time in Patent Office: Days
• US Class Current: 382/103
• CPC Class Codes: G01C 21/28 with correlation of data from several navigational instruments
• CPC Class Codes: G01C 21/3647 Guidance involving output of stored or live camera images or video streams

Abstract

A system stores reference data generated by associating image feature point data with an image-capturing position and a recorded vehicle event. The system generates data for matching by extracting image feature points from an actually-captured image. The system generates information on an actual vehicle event, extracts first reference data whose image-capturing position is located in a vicinity of an estimated position of the vehicle, and extracts second reference data that includes a recorded vehicle event that matches the actual vehicle event. The system performs matching between at least one of the first reference data and the second reference data, and the data for matching, and determines a position of the vehicle based on the matching.

Claims

1. A vehicle position detection system comprising:

a reference data database in which reference data is stored, wherein the reference data is generated by associating image feature point data generated by extracting image feature points from a captured image obtained by capturing a scene viewed from a vehicle, with an image-capturing position at which an image is captured to obtain the captured image corresponding to the image feature point data, and a recorded vehicle event that indicates a vehicle event at when the image is captured to obtain the captured image;

a captured image processing unit to which an actually-captured image is input, and which outputs data for matching generated by extracting image feature points from the actually-captured image, wherein the actually-captured image is obtained by capturing an image of a scene using a vehicle-mounted camera;

a vehicle event evaluation unit that generates information on an actual vehicle event that is a vehicle event detected by the vehicle;

a first reference data output unit that extracts first reference data whose image-capturing position is located in a vicinity of an estimated position of the vehicle, from among a set of the reference data stored in the reference data database, based on the estimated position of the vehicle, and outputs the extracted first reference data as a matching candidate for the data for matching;

a second reference data output unit that extracts second reference data that includes the recorded vehicle event that matches the actual vehicle event, from among the set of the reference data stored in the reference data database, based on the vehicle event, and outputs the extracted second reference data as the matching candidate for the data for matching;

a matching performing unit that performs matching between at least one of the first reference data and the second reference data, and the data for matching; and

a vehicle position determination unit that determines a position of the vehicle, based on the image-capturing position associated with the reference data that matches the data for matching.

2. The vehicle position detection system according to claim 1, wherein

each of the first reference data output unit and the second reference data output unit is configured to extract the reference data whose image-capturing position is included in a reference data extraction range that is defined as a range of positions;

the reference data extraction range for the first reference data output unit is set so that a center of the reference data extraction range for the first reference data output unit is the estimated position of the vehicle; and

the reference data extraction range for the second reference data output unit is set to be larger than the reference data extraction range for the first reference data output unit.

3. The vehicle position detection system according to claim 1, wherein

processing of extracting the first reference data is performed by the first reference data output unit, in preference to processing of extracting the second reference data, which is performed by the second reference data output unit.

4. The vehicle position detection system according to claim 1, wherein

processing of extracting the second reference data is performed by the second reference data output unit, in preference to processing of extracting the first reference data, which is performed by the first reference data output unit.

5. The vehicle position detection system according to claim 2, wherein

the reference data extraction range for the second reference data output unit is set to a range determined based on a range over which the vehicle has traveled from a starting point, wherein the starting point is a position of the vehicle obtained when the first reference data output by the first reference data output unit matched the data for matching.

6. The vehicle position detection system according to claim 1, wherein

the vehicle event includes a vehicle behavior caused by a specific traveling state of the vehicle on a road.

7. The vehicle position detection system according to claim 1, wherein

the vehicle event includes detection of a specific road marking on a road on which the vehicle is traveling.