Vehicle lateral and vertical view drawing method based on laser-point cloud data and GDI (graphics device interface)

A technology of laser point cloud data and point cloud data, which is applied in the direction of using optical devices, electromagnetic wave re-radiation, and utilization of re-radiation, can solve the problems of unable to display the details of the vehicle outline, difficult to rectify the vehicle in time, and unable to observe the vehicle exceeding the limit Location etc.

Inactive Publication Date: 2019-12-03
ZHEJIANG UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] (1) Only the outline shape of the inspected vehicle can be drawn, and the outline details of the vehicle cannot be displayed
[0005] (2) Boundary marking lines are not drawn on the side a

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  • Vehicle lateral and vertical view drawing method based on laser-point cloud data and GDI (graphics device interface)
  • Vehicle lateral and vertical view drawing method based on laser-point cloud data and GDI (graphics device interface)
  • Vehicle lateral and vertical view drawing method based on laser-point cloud data and GDI (graphics device interface)

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[0038] The present invention will be described in detail below in conjunction with the embodiments.

[0039] Reference figure 1 , A method for drawing vehicle side and top view based on laser point cloud data and GDI, including the following steps:

[0040] Step 1: After the vehicle enters the detection area, collect the point cloud data scanned by the lidar, and perform preliminary filtering of the point cloud data; the process is as follows:

[0041] Step 1.1: Obtain the point cloud data L={(x i ,y i )|i=0,1,...,k-1} and the point cloud data scanned by the right lidar R={(x i ,y i )|i=0,1,...,k-1}, k is the number of points in the point cloud data of the current frame, and the number of coordinate points in the point cloud data frame scanned by the left and right lidar is the same. In this example k=274;

[0042] Step 1.2: Eliminate L and R satisfying y i >h 1 Coordinate point, where h 1 Represents the upper limit of the threshold value of the coordinate value in the Y-axis direct...

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Abstract

The invention discloses a vehicle lateral and vertical view drawing method based on laser-point cloud data and a GDI (graphics device interface). The method comprises following steps: 1), acquiring point cloud coordinate data required by drawing a lateral view and a vertical view of a vehicle in the time period of vehicle outline size detection based on left and right lasers; 2), calculating average speed of vehicle traveling by an optoelectronic switch group, and calculating a Z-axis direction coordinate value of a coordinate point in point cloud data per frame according to scanning frequencyf and the average speed of the laser radars; 3), converting three-dimensional point cloud data into two-dimensional coordinate point data needed by different views; 4), drawing the lateral view and the vertical view of the detected vehicle by the Windows GDI; and 5), drawing a boundary marking of the detected vehicle. The vehicle outline shape and the boundary marking can be displayed more directly and more clearly by the drawn vehicle lateral view and vertical view, if the vehicle outline size cannot meet the national standard requirement, and the overlimit position of the vehicle can be found out by detectors and a vehicle owner on the basis.

Description

technical field [0001] The invention belongs to the field of vehicle side and top view drawing, in particular to a side and top view drawing method based on laser point cloud data and Windows graphics device interface (GDI). Background technique [0002] At present, most of the automatic measurement systems for vehicle outline dimensions based on lidar on the market can only display the numerical results obtained when displaying the detection results, but cannot display the side and top views of the detected vehicle. The few automatic measurement systems that can display the side and top views of the inspected vehicle can only draw the rough outline of the inspected vehicle. These views still cannot allow inspectors and inspected vehicle owners to understand the inspection results more intuitively and quickly. Therefore, it is necessary to realize a vehicle side and top view drawing method that has good display effect, high definition, and can intuitively reflect the detecti...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01B11/00
CPCG01B11/002G01S17/89
Inventor 王晓东王孖豪
Owner ZHEJIANG UNIV OF TECH
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