Quality inspection of lighting system used in surface quality inspection of brake pads

To realize the design quality inspection of the lighting system used in the machine vision system for surface quality inspection of brake pads, an automatic quantitative inspection method based on image grayscale indexes is designed. Brake pad images, illuminance mean values and standard deviations were captured under different working conditions of the illumination system; On the basis of image segmentation, 7 grayscale feature indexes of brake pads in grayscale images were extracted; The degree of gray distribution V and the gray distribution G were respectively used to represent the illuminance mean values and standard deviations based on correlation analysis between 7 grayscale feature indexes and illuminance mean values, standard deviations; The design quality of lighting systems can be inspected by using the testing model based on grayscale feature indexes V and G. The test results of 688 images of 8 brake pads captured under lighting conditions using 87 different lighting systems showed that the inspection model based on gray distribution degree V and gray distribution G can realize the quantitative inspection of the design quality of the lighting systems, and the correct rate was 90.99%. © 2018, Science Press. All right reserved.