Vehicle speed measurement method, supervisory computer and vehicle speed measurement system

A measuring method, technology of monitoring machine

Active Publication Date: 2010-11-03
HANGZHOU HIKVISION DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many cameras used in binocular and multi-eye cameras, the installation is troublesome, and stereo matching is difficult
Based on the

Method used

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  • Vehicle speed measurement method, supervisory computer and vehicle speed measurement system
  • Vehicle speed measurement method, supervisory computer and vehicle speed measurement system
  • Vehicle speed measurement method, supervisory computer and vehicle speed measurement system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0064] Example one

[0065] See figure 1 , Is a vehicle speed measurement method provided by an embodiment of the present invention, including the following steps:

[0066] Step S101: The monitoring machine receives multiple frames of images collected by the close-up camera at a preset frequency for the vehicle to be tested.

[0067] Because the time for the vehicle to pass through the field of view is very short, generally less than 1 second, in order to ensure real-time requirements, it is preferable that the close-up camera collects 25 frames of images per second, and the interval between the close-up camera images is required to be as equal as possible, so that It uses the number of frames passed by the vehicle to estimate the time spent.

[0068] Step S102: The monitoring machine calculates the license plate running trajectory of the multi-frame images, determines whether the license plate running trajectory is correct, and selects a multi-frame image with the correct license pla...

Example Embodiment

[0131] Example two

[0132] See Figure 4 , Is a monitoring machine provided by an embodiment of the present invention for vehicle speed measurement, including:

[0133] Receiving module 401: used to receive multiple frames of images collected by the close-up camera for the vehicle under test at a preset frequency;

[0134] Image selection module 402: used to calculate the license plate running trajectory of the multi-frame images, determine whether the license plate running trajectory is correct, and select multi-frame images with the correct license plate running trajectory as the image group to be analyzed;

[0135] Vehicle speed calculation module 403: used to track and calculate the license plate imaging distance of multiple frames of images in the image group to be analyzed, and calculate the actual distance corresponding to the imaging distance according to the corresponding relationship between the real world coordinate system and the imaging coordinate system, and use the actu...

Example Embodiment

[0145] Example three

[0146] See Figure 5 , Is a vehicle speed measurement system provided by an embodiment of the present invention, including: a close-up camera 501, a supplementary light source 502, and the monitoring machine 503 described in the foregoing embodiment,

[0147] The optical axis of the close-up camera 501 is on the driving route of the vehicle under test, and images are collected at a preset frequency and sent to the monitoring machine 503;

[0148] The supplemental light source 502 is used to supplement the brightness of the close-up camera 501 when the light is insufficient;

[0149] The monitoring machine 503 is used to calculate the license plate running trajectory of the multi-frame images sent by the close-up camera 501, determine whether the license plate running trajectory is correct, and select the multi-frame image with the correct license plate running trajectory as the image group to be analyzed; Analyze the license plate imaging distance of the multip...

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Abstract

The invention discloses a vehicle speed measurement method, a supervisory computer and a vehicle speed measurement system. The method comprises the following steps of: receiving multiframe images collected by a close-up camera aiming at a vehicle to be tested according to a preset frequency by the supervisory computer; calculating the running track of a licence plate, and selecting the multiframe image with correct track as an image group to be analyzed; and tracking and calculating the imaging distance of the licence plate in the image group to be analyzed, calculating the actual distance corresponding to the imaging distance according to the correspondence between a real world coordinate system and an imaging coordinate system, dividing the actual distance by the time difference of the corresponding image obtained by calculating according to the preset frequency to obtain the current tracking vehicle speed, and averaging to obtain the vehicle speed of the vehicle to be tested. The supervisory computer comprises a receiving module, an image selecting module and a speed calculating module. The system comprises the close-up camera, a supplementary light source and the supervisory computer. The invention needs no extra vehicle speed detection equipment or a plurality of cameras for matching, has convenient installation, simple equipment and more flexible and various application scenes, and has the advantages of strong robustness and high speed measurement precision.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a vehicle speed measurement method, a monitoring machine and a vehicle speed measurement system. Background technique [0002] Speed ​​measurement is an important means of traffic law enforcement. The current speed measurement methods mainly include the speed measurement method using auxiliary equipment and the speed measurement method based on video technology. [0003] The speed measurement methods using auxiliary equipment mainly include radar speed measurement and ground induction coil speed measurement. In speed measurement, auxiliary equipment such as laser, radar or ground induction coil are respectively required. During the measurement, vehicles are easy to interfere with each other and cause confusion, and Due to the limitation of auxiliary equipment, the data collection is not flexible enough. [0004] According to the principle of vision technology, it is divided int...

Claims

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Application Information

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IPC IPC(8): G08G1/052G08G1/017
Inventor 王伟简武宁胡扬忠邬伟琪
Owner HANGZHOU HIKVISION DIGITAL TECH
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