Process for the Automatic Longitudinal Guidance of a Motor Vehicle

• US 20110228986A1
• Filed: 03/07/2011
• Published: 09/22/2011
• Est. Priority Date: 03/16/2010
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: SEYFFARTH, Torsten, Walessa, Marc
• Granted Patent: US 8,447,073 B2
• Time in Patent Office: Days
• US Class Current: 382/104
• CPC Class Codes: B60W 30/17 with provision for special action when the preceding vehicle comes to a halt, e.g. stop and go
• CPC Class Codes: G06V 20/58 Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads

Abstract

For the automatic longitudinal guidance of a motor vehicle having a longitudinally guiding driver assistance system with a stop-and-go function, at least starting from a point-in-time wherein the motor vehicle is stopped, the vehicle apron is continuously monitored for possible obstacles by a monitoring device having a camera which supplies a sequence of individual images of the vehicle apron. For the detection of obstacles in the vehicle apron, characteristic image features are extracted from the individual images and are tracked with respect to time within the sequence of individual images, and an appearance and/or disappearance of one or more characteristic image features taking place in the course of the sequence is determined and evaluated. Additionally or alternatively, a change of a spatial distribution of one or more characteristic image features taking place in the course of the sequence in the respective individual image or in a cutout of the latter is determined and evaluated.

Claims

1. A process for detecting obstacles in a vehicle apron of a vehicle equipped with a longitudinal guidance driver assistance system having a stop-and-go function, wherein information is detectable concerning a vehicle driving ahead by a detection device of the driver assistance system, and wherein the vehicle is automatically brakable to a standing position as a function of the information detected by the detection device, the process comprising the acts of:

beginning at least from a point-in-time wherein the vehicle is stopped, supplying a sequence of individual images of a monitored vehicle apron area by way of a camera;

for detecting obstacles in the vehicle apron area, extracting characteristic image features from the sequence of individual images and tracking the extracted characteristic image features over time within the sequence of individual images;

at least one of;

(1) determining and evaluating characteristic image features appearing and/or disappearing in the course of the sequence of individual images to provide obstacle recognition; and

(2) determining and evaluating a spatial distribution change of one or more characteristic image features occurring in the course of the sequence in one of a respective individual image and a cutout of the respective individual image.

2. The processing according to claim 1, wherein the act of determining and evaluating the spatial distribution change in the cutout of the respective individual image further comprises:

defining the image cutout in an essentially constant manner by the spatial distribution of the characteristic image features in one or more individual images at a beginning of the sequence for evaluating a remainder or the entire sequence.

3. The process according to claim 1, wherein for detecting obstacles in the vehicle apron, the process further comprises at least one of the acts of:

creating and evaluating differential images in each case from a first individual image and a second individual image taken after the first individual image; and

determining and evaluating vectors of an optical flux of image information of at least one portion of image elements of two individual images taken one after another and composed of individual image elements.