Size Measurement and Weight Estimation of Filter Screen Based on Machine Vision

Filter screens are widely used in automotive manufacturing. In order to solve the problem of low manual inspection efficiency and large measurement errors, a non-contact automatic measurement method based on machine vision is proposed. First, the filter screen image is captured by the camera, and the image is pre-processed using grayscale and binary segmentation to eliminate noise and extract the filter area; then the pixel size is extracted using XLD edge detection; later, the actual value of the filter size is measured by coordinate system conversion; finally, the weight of the filter is calculated by the hollow rate. The experiment shows that the measurement error of the diameter of the inner and outer circle of the bottom surface of the filter screen is within 0.1mm, and the measurement error of the weight is within 0.8g, which meets the need of dimensional measurement of the filter screen production.