Abstract：In order to solve the problem of distortion caused by the installation position of the camera system when the illumination image of the lamp module is collected, the plane template method is used to correct the distortion of the system through the distortion correction algorithm, so as to reduce the measurement error caused by the distortion of the image coordinate position. In view of the influence of the uneven illumination of the image plane on the gray value of the image, the method of plane template is used to correct the distortion of the system. After the correction coefficient of the camera system is obtained in the illumination uniformity correction experiment, the correction coefficient is processed by the surface fitting method based on the combination of Marquardt method and general global optimization algorithm, and the function model of pixel coordinates and correction coefficient is obtained to realize the correction of image gray value. The calibration of the corrected camera system is carried out to establish the relationship between gray level and illuminance, so as to improve the accuracy of illumination detection of lamp module. The experimental results show that the error of illuminance detection of lamp module is basically controlled within 10%, and the repeatability error is less than 1%, which has high accuracy and reliability.
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2020, Vol. 41 
