Arrow signal recognition device

a signal recognition and signal technology, applied in the field of arrow signal recognition devices, can solve the problems of reducing the precision of recognition of arrow signal lights, difficulty in afar from the light bulb itself, and inconvenient use of light bulbs, so as to achieve high precision

Active Publication Date: 2015-07-02
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patent is to create an arrow signal recognition device that can accurately detect crude or precise arrow signals from a distance.

Problems solved by technology

Further, the brightness of the light bulb itself is not constant.
As a result, in the case where extraction of an arrow signal light is performed with a threshold being a color feature amount of a predetermined RGB ratio as disclosed in the document mentioned above, recognition itself of the arrow signal light may be difficult from afar where a vehicle equipped with this technique is relatively distant from a traffic light, for example.
However, there is a problem that the precision of recognition of an arrow signal light decreases.

Method used

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Examples

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Embodiment Construction

[0021]One example of the present invention will be described below with reference to the drawings. Reference numeral 1 in FIG. 1 denotes a vehicle such as an automobile. In a front portion in the interior of the vehicle 1, an onboard camera 2 is placed in an upper portion of a front windshield. The onboard camera 2 is a stereo camera formed of a main camera 2a and a sub camera 2b. The respective cameras 2a and 2b are built in with an imaging element (image sensor) such as a CCD or CMOS and are arranged, for example, in symmetrical positions on the left and right across a rear-view mirror arranged in the middle in the vehicle width direction. Hereinafter, the onboard camera 2 refers to both the main camera 2a and the sub camera 2b for the sake of convenience, unless otherwise stated.

[0022]The onboard camera 2 is a color camera that captures a color image of a driving environment of a path on which the vehicle 1 is travelling. Pixel data of each imaging element is set with a luminance...

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PUM

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Abstract

Based on an image captured by an onboard camera, an arrow signal detector sets an arrow signal area on the basis of a signal light distance between a lit red signal light of a traffic light and a vehicle equipped with the arrow signal recognition device, counts the number of color tone effective pixels assumed as being lit within each arrow signal area, further searches for and counts color tone ineffective pixels in the color tone effective pixels on the basis of pixel information on the vicinity of each color tone effective pixel, and calculates an arrow effective pixel number from the difference between the number of color tone effective pixels and the number of color tone ineffective pixels.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority from Japanese Patent Application No. 2013-271587 filed on Dec. 27, 2013, the entire contents of which are hereby incorporated by reference.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to an arrow signal recognition device that recognizes an arrow signal light provided to a traffic light, on the basis of an image captured by an onboard camera.[0004]2. Related Art[0005]Conventionally, a technique is known in which a traffic light and an arrow signal light provided to the traffic light are recognized based on a driving environment ahead of a vehicle that is image-captured by a camera (hereinafter referred to as “onboard camera”) mounted to the vehicle.[0006]For example, Japanese Unexamined Patent Application Publication No. 2012-168592 discloses a technique of extracting an arrow signal light by detecting a red signal of a traffic light based on an image captured by an onboard ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06K9/00G06K9/46G06V10/56
CPCG06K9/4652G06K9/00791G06V20/584G06V10/56G06V20/56
Inventor NAKAGAWA, RYO
Owner SUBARU CORP
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