Vehicle-installation obstacle detection apparatus

• US 20090240432A1
• Filed: 03/16/2009
• Published: 09/24/2009
• Est. Priority Date: 03/18/2008
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Osanai, Satoshi
• Granted Patent: US 8,180,561 B2
• Time in Patent Office: Days
• US Class Current: 701/300
• CPC Class Codes: G06T 2207/30261 Obstacle
• CPC Class Codes: G06T 7/74 involving reference images or patches
• CPC Class Codes: G06V 20/584 of vehicle lights or traffic lights
• CPC Class Codes: G08G 1/165 for passive traffic, e.g. including static obstacles, trees

Abstract

A vehicle-installed obstacle detection apparatus includes a forward-view camera, and processes resultant image data to detect objects as possible obstacles. A size value such as tail lamp spacing, transmitted from a preceding vehicle, and a corresponding size value as measured in a captured image, are used to calculate the distance of the preceding vehicle. This is used together with a height value transmitted from the preceding vehicle and a corresponding height value measured in the captured image, to calculate the relative height difference between the vehicles, which is then used to discriminate between detected objects which are actual obstacles and objects such as road surface markers.

Claims

1. An obstacle detection apparatus comprising

an electronic camera installed on a vehicle, configured to capture an image of an external view ahead of said vehicle, and

image processing circuitry configured to process data produced by said camera, expressing said image, for detecting objects which may constitute obstacles located ahead of said vehicle;

wherein said obstacle detection apparatus comprises;

a memory having image parameter information specific to said camera stored therein;

communication circuitry configured to perform at least one of two modes of communication, said modes comprising inter-vehicle communication between said vehicle and a preceding vehicle and road-to-vehicle communication between said vehicle and a roadside apparatus;

information generating circuitry configured to derive size dimension information expressing a size dimension of an object detected by said image processing circuitry, as measured in an image plane of said camera;

information acquisition circuitry configured to acquire, via said communication circuitry, actual size dimension information expressing an actual size dimension of a specific obstacle located ahead of said vehicle; and

distance calculation circuitry configured to calculate a value of distance of said specific obstacle, based upon said size dimension derived by said information generating circuitry, said actual size dimension, and said image parameter information.

2. An obstacle detection apparatus according to claim 1, wherein said actual size dimension is a distance between a pair of objects which are located on said specific obstacle.

3. An obstacle detection apparatus according to claim 1, wherein:

said information acquisition circuitry is configured to acquire above-ground height information in conjunction with said actual size dimension information, said above-ground height information expressing an actual height value of said pair of objects above a road surface, and

said obstacle detection apparatus comprises ground height difference calculation circuitry configured to calculate a ground height difference value as a difference between a height of a road surface on which said vehicle is situated and a height of a road surface on which said specific obstacle is situated, said calculation being based upon said distance value calculated by said distance calculation circuitry, said above-ground height value obtained by said information acquisition circuitry, and said image parameter information.

4. An obstacle detection apparatus according to claim 3, comprising discrimination circuitry configured to judge each of respective objects that are detected by said image processing circuitry, with said judgement executed based upon said ground height difference value, for discriminating between objects which constitute actual obstacles and objects which do not constitute actual obstacles.

5. An obstacle detection apparatus according to claim 4, wherein said objects which do not constitute actual obstacles comprise markers formed upon a road surface.

6. An obstacle detection apparatus according to claim 2, wherein said specific obstacle is a preceding vehicle, and said pair of objects comprise a pair of tail lamps of said preceding vehicle.

7. An obstacle detection apparatus according to claim 1, wherein:

said information acquisition circuitry is configured to acquire position information expressing a position of said specific obstacle, in conjunction with said actual size dimension information, and

said image processing circuitry is configured to delimit a specific area within said image as an image processing area, based upon said position information, and to perform said object detection by processing of image data corresponding to said image processing area.