Method for correcting automobile headlamp detecting light bundle shining direction deviation

Abstract

The invention discloses a method for conducting error correcting on measuring data of light bundle shining directions of an automobile headlamp detecting instrument in vehicle detecting. The method is mainly applicable to the full-automatic detecting process of an automobile headlamp. A system is composed of a camera installed right above a vehicle to be tested, a computer, and the automobile headlamp detecting instrument. A light bundle shining direction measurement error is formed by the offset angle between an image plane and a detecting site, and the automobile lengthwise axis offset angle of an image. A rotary matrix between an image coordinate system and a world coordinate system is obtained through camera calibration, and then the image offset angle is obtained. The automobile lengthwise axis offset angle of the image is obtained based on a quick realizing method of a largest second order central moment algorithm. According to the method, the measurement data of the headlamp detecting instrument can be corrected automatically, the accuracy rate and the repeatability of a headlamp bundle shining direction detecting result are effectively improved, and guarantee is provided for safety running of an automobile at night.

Description

technical field [0001] The invention relates to a method for correcting the error of the beam irradiation direction measurement data of an automobile headlamp detector in vehicle inspection, by detecting the deviation between the actual longitudinal axis of the automobile and the ideal automobile position, and correcting the beam irradiation direction of the automobile headlamp Amendment is carried out to improve the detection accuracy and correct rate, and it is suitable for the automatic detection of automobile headlights in vehicle safety performance detection stations. Background technique [0002] Headlight detection is an important item in the evaluation of vehicle safety performance. It is used to ensure the safe operation of the vehicle at night or under poor visual conditions. The main detection content includes luminous intensity and irradiation direction. At present, the equipment widely used in the detection of headlights is the headlight tester. When the vehicle...

AI Technical Summary

Problems solved by technology

Aiming at the problems of inaccurate measurement data and poor repeatability in the detection of automobile headlights, using camera calibration and image processing technologies to analyze the deviation between the actual parking position of the car and the ideal parking position, and automatically compare the measurement data of the headlight detector Make corrections to effectively improve the accuracy of the detection results of the headlight beam irradiation direction, and provide guarantee for the safe driving of the car at night

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