Automobile body inclination degree measurement method of small automobile
A measurement method and technology of small cars, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of low precision and inconvenient measurement, and achieve the effect of simple hardware structure
Inactive Publication Date: 2013-11-27
LINYI UNIVERSITY
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Problems solved by technology
[0007] In order to overcome the problems of inconvenient measurement and low precision of the conventional method, the present invention provides a non-contact measurement method based on digital image processing technology to realize the automatic detection of the inclination of the small car body
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[0047] refer to figure 1 Build a small car body inclination measurement system. In an embodiment of the present invention, the car to be inspected is parked on the car straightener, and a CMOS digital camera is set directly ahead, about 2 meters away from the front end of the car. When the system is running for the first time, first perform camera calibration, adjust the position of the camera and the car squarer, align the two, and complete the initialization of the system. Park the car at the detection position, take a picture of the front end of the car, and analyze the inclination of the car body through the computer program. The program executed by the computer is as follows: Figure 4 shown. The following table lists the measurement results of the body inclination of three ordinary family cars (the unit is ').
[0048]
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The invention provides an automobile body inclination degree measurement method of a small automobile. The automobile body inclination degree measurement method is mainly suitable for appearance inspection and performance detection of the small automobile. A measurement system comprises a computer, an automobile straightening device and a camera installed right in front of the to-be-detected automobile. The camera and the to-be-detected automobile are aligned through calibrating of a video camera, and an image of the front end face of the automobile is shot and transmitted to the computer. A front license plate area of the automobile is pre-estimated. A front license plate profile of the automobile is extracted based on Hough conversion restricted by a length-to-width ratio and a front license plate is accurately positioned. According to the relative position relationship of the front license plate and head lamps of the automobile, detection areas of the head lamps of the automobile are pre-estimated, image division is carried out on the pre-estimated detection areas, the profiles of the head lamps are extracted, the center, namely the horizontally symmetric point, of the left head lamp area and the right head lamp area is obtained in a centroid method, and accordingly the automobile body inclination degree is obtained. The method is a non-contact measurement method, the automobile body inclination degree of a small automobile can be automatically detected, and the method can be integrated with other detection items easily, and has good extensibility.
Description
technical field [0001] The invention relates to a non-contact method for automatically measuring the inclination of a small car body. It extracts left and right symmetry points of the car body based on digital image processing technology, calculates the angle of inclination of the car body, and is suitable for external contour inspection and performance detection of small cars. Background technique [0002] With the rapid development of the automobile industry, higher and more detailed requirements are put forward for automobile detection and diagnosis technology. In terms of car appearance, the height difference between the left and right symmetrical points of the car body and the detection of the inclination of the car body have also attracted more attention. The tilt of the car body means that the height difference between the left and right symmetrical points of the car body and the horizontal ground exceeds the standard, causing the left and right asymmetry of the car b...
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IPC IPC(8): G01B11/26
Inventor 陈佩江
Owner LINYI UNIVERSITY
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