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A single image truck volume measurement method based on 3D model

A technology of volume measurement and truck, applied in the field of truck volume measurement and toll collection system, can solve the problems of high work intensity and low degree of automation, and achieve the effect of improving measurement efficiency, avoiding manual measurement, high speed and accuracy

Inactive Publication Date: 2017-11-21
XIDIAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a single image truck volume measurement method based on 3D model, to solve the problem of high work intensity and low degree of automation of the current measurement method

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  • A single image truck volume measurement method based on 3D model
  • A single image truck volume measurement method based on 3D model
  • A single image truck volume measurement method based on 3D model

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Embodiment Construction

[0039] refer to figure 1 , the truck volume measurement steps of the present invention are as follows:

[0040] Step 1, establish a virtual reality environment.

[0041] (1.1) Express the real camera intrinsic parameter matrix as: Use a real camera to take 9 photos of the calibration board at different angles, such as figure 2 Shown; use the matlab camera calibration toolbox to process these 9 photos to get the internal parameter matrix K of the real camera, where f is the focal length of the real camera, (u o ,v o ) is the pixel coordinate of the center of the camera imaging plane;

[0042] (1.2) Use the calibrated internal parameter matrix K of the real camera to calculate the viewing angle of the virtual camera Imaging plane aspect ratio γ = v o / u o ; Set the position ρ=10000 of the far clipping plane, the position μ=100 of the near clipping plane; Use the function statement gluPerspective (β, γ, ρ, μ) in the OpenGL function library to set the internal parameter ...

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Abstract

The invention discloses a single image truck volume measurement method based on a 3D model, which mainly solves the problems of high work intensity and low automation degree of the current measurement method. The implementation process is as follows: 1. Calibrate the internal parameters of the real camera, and use the OpenGL function library to build a virtual reality environment, and import the picture of the truck under test and the 3D model of the truck in the environment; Identify and establish the connection between the truck picture under test and the 3D model of the truck; 3. Use the points to be matched on the picture of the truck under test and the control points on the 3D model of the truck to automatically match the 3D model of the truck with the picture of the truck under test;4 .According to the proportional relationship between the virtual reality environment and the real environment, use the volume of the truck 3D model to calculate the volume of the truck under test. The invention has fast and accurate measurement and high degree of automation, and can be used in the toll collection system of expressways.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a method for measuring the volume of a truck, which is used in a toll system of an expressway. Background technique [0002] At present, for trucks, expressway toll stations have to first measure the volume of the truck compartment, and then charge the truck according to the volume of the truck compartment. At present, the measurement of the volume of trucks by expressway toll stations generally adopts the method of manual measurement, which measures the length, width and height of the vehicle respectively, and then calculates the volume of the vehicle. Using this method of manual measurement, the workload of the operator is relatively large, and the measurement accuracy is difficult to guarantee, especially in the case of heavy traffic flow and bad external weather conditions, the work intensity of the operator is relatively high. Therefore, it is very important to stu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/33G06T7/62
Inventor 孙伟李鹏慧赵春宇郭宝龙
Owner XIDIAN UNIV
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