An automobile orthographic projection area measuring device

Abstract

The invention discloses a measuring device for the orthographic projection area of ​​an automobile, which belongs to the field of applying image processing technology to image measurement, and aims to calculate the orthographic projection area of ​​an automobile without CAD data. The specific technical solution is: the image acquisition module includes a background board, a standard board, and a camera; the image processing module includes an image grayscale module, a histogram equalization module, an image smoothing module, an image segmentation module, a contour extraction module and Outline area calculation module; the length L1 of the two transverse square steel pipes of the background plate 1 is greater than or equal to 1.5 times the width of the measured car, and the length L2 of the two longitudinal square steel pipes is greater than or equal to 1.5 times the height of the measured car; The horizontal distance L between the background board and the camera is greater than or equal to 70m; the distance L3 between the background board and the measured car rearview mirror is 7m-10m. The invention has the advantages of high calculation efficiency, high calculation precision, no artificial error and the like.

Description

technical field [0001] The invention relates to an automobile front projection area measuring device, which applies image processing technology to image measurement. Background technique [0002] When conducting an automobile wind tunnel test, in order to objectively evaluate the aerodynamic characteristics of the test model, it is necessary to obtain its orthographic projection area, but the current method is usually to reconstruct the test model digitally, and then input the automobile CAD data into the fluid software to calculate Orthographic projection area, but this method needs to use reverse engineering first to obtain its surface point cloud data, and then obtain the CAD data of the car, which undoubtedly increases the difficulty of obtaining the orthographic projection area. Contents of the invention [0003] The object of the present invention is to solve the above problems, and provide a convenient, accurate, flexible and portable automobile front projection are...

AI Technical Summary

Problems solved by technology

[0002] When conducting an automobile wind tunnel test, in order to objectively evaluate the aerodynamic characteristics of the test model, it is necessary to obtain its orthographic projection area, but the current method is usually to reconstruct the test model digitally, and then input the automobile CAD data into the fluid software to calculate Orthographic projection area, but this method needs to first use reverse engineering to obtain its surface point cloud data, and then obtain the CAD data of the car, which undoubtedly increases the difficulty of obtaining the orthographic projection area

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