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Method and device for measuring distance between vehicles and vehicle

A measurement method and technology of measurement device, applied in measurement device, photogrammetry/video measurement, surveying and navigation, etc., can solve the problem that millimeter wave radar is susceptible to electromagnetic wave interference, high cost of laser technology, short ultrasonic measurement distance, etc. problem, to achieve the effect of stable performance, large measurement range, fast and accurate detection and positioning

Active Publication Date: 2015-08-26
SHENZHEN TCL IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a vehicle distance measurement method and device, which aims to solve the problem that the ultrasonic measurement distance in the prior art is relatively short, the millimeter wave radar is relatively easy to be interfered by electromagnetic waves, and the cost of laser technology is too high

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  • Method and device for measuring distance between vehicles and vehicle
  • Method and device for measuring distance between vehicles and vehicle
  • Method and device for measuring distance between vehicles and vehicle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] figure 1 A flowchart showing the implementation of the vehicle distance measurement method provided by Embodiment 1 of the present invention is described in detail as follows:

[0051] In S101, through the two cameras of the binocular vision system, images of the scene ahead of the current vehicle are collected synchronously.

[0052] In the embodiment of the present invention, two cameras can be added at the front end of the current vehicle, and the installation position of the cameras can be located at the upper part of the front windshield or at the front of the vehicle, such as figure 2 Shown is a schematic diagram of the typical installation position of the camera on the vehicle. The two cameras can realize the synchronous acquisition of images, and the collected images are handed over to the measurement system for subsequent processing.

[0053] In S102, the license plate area candidates in the image captured by each camera are acquired, and the feature vector c...

Embodiment 2

[0066] Figure 4 A flow chart showing the implementation of the method for measuring vehicle distance provided by Embodiment 2 of the present invention is described in detail as follows:

[0067] In S401, two cameras of the binocular vision system are calibrated.

[0068] In this embodiment, by calibrating the two cameras of the binocular vision system, the internal and external parameters of the two cameras and the relative spatial positions of the two cameras can be obtained respectively (which can be represented by a rotation matrix and a translation matrix). Specifically, the (Radial Alignment Constraint, RAC) two-step method can be used for calibration. The calibration of the camera only needs to be performed once, and there is no need to repeat the calibration every time it is used. The calibration parameters obtained can be stored in the internal memory of the measurement system. , to be called when calculating the distance between the current vehicle and the vehicle i...

Embodiment 3

[0091] Figure 10 It shows the structural diagram of the vehicle distance measurement device provided by the third embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown. The device can be a software unit, a hardware unit or a built-in vehicle. Soft and hard combination unit.

[0092] In this embodiment, the device includes: an acquisition unit 101 , an acquisition unit 102 , a judgment unit 103 , a first calculation unit 104 , and a second calculation unit 105 .

[0093] The acquisition unit 101 is used to synchronously acquire images of the scene ahead of the current vehicle through the two cameras of the binocular vision system;

[0094] The obtaining unit 102 is used to obtain the candidate license plate area in the image collected by each camera, and extract the feature vector corresponding to each candidate license plate area;

[0095] Judging unit 103, for judging whether the c...

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Abstract

The invention, which is suitable for the machine vision field, provides a method and apparatus for measuring a vehicle distance and an automobile. The method comprises the following steps that: two cameras of a binocular vision system are used to collect images of scenes in front of a current vehicle synchronously; a candidate license plate region in the image collected by each of the cameras is obtained and a feature vector corresponding to each candidate license plate region is extracted; whether the candidate license plate region corresponding to each of the feature vectors is a real license plate region; a center position of the real license plate region is calculated; and according to the center position as well as a binocular stereo vision measurement principle, a distance between the current vehicle and a vehicle in front of the current vehicle is calculated. According to the invention, rapid and accurate detection and positioning on an automobile license plate in a complex background image is realized; and the distance between the current vehicle and a vehicle in front of the current vehicle in the vision angle range of the camera is calculated. The measurement range is large; and the measuring process can be realized simply and conveniently; and the performance for measurement is stable.

Description

technical field [0001] The invention belongs to the technical field of machine vision, and in particular relates to a vehicle distance measurement method, device and automobile. Background technique [0002] With the advent of the era of high-speed transportation, automobiles have become an indispensable and common means of transportation in people's lives. However, automobile accidents have also risen sharply, and most of the automobile collision accidents are caused by excessive driving speed, small distance between vehicles, and untimely braking. Yes, especially in passing vehicles, if the driver is overtired or inattentive, it is more likely to cause the distance between the vehicle on his side and the vehicle in front to be too close, so that he cannot avoid it and cause an accident. In order to reduce the rate of such accidents, the distance between the vehicle in front and one's own vehicle can be measured and calculated by the distance measuring equipment in front, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/00G01C11/04
Inventor 陈永洒吴美芬邵诗强
Owner SHENZHEN TCL IND RES INST
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