Large spur gear geometric parameter measurement system and method based on machine vision

Abstract

The invention provides a large straight gear geometric parameter measurement system and method based on machine vision, and the method comprises the steps: firstly adjusting a camera to a proper position, and enabling the camera to clearly shoot a needed picture; calibrating the camera to obtain an internal reference matrix and a distortion vector of the camera; preprocessing the shot tooth profile local image, wherein the preprocessing comprises distortion correction, image filtering and threshold segmentation; extracting a tooth profile edge local image by using an edge extraction algorithm, and further finely positioning the edge by using a sub-pixel method to obtain a sub-pixel edge; then, extracting key angular points of the tooth profile by using an angular point extraction algorithm, and determining a sub-pixel center of the tooth profile according to the angular points; according to the sub-pixel center, obtaining a gear root circle radius and an addendum circle radius under the pixel coordinate; and through pixel equivalent calibration, obtaining a real root circle radius and an addendum circle radius of the gear, thereby calculating a modulus and a reference circle radius of the gear, and completing measurement of geometric parameters of the large straight gear. According to the method, the measurement automation degree of the geometric parameters of the large straight gear is higher, the function of integrating monocular camera calibration, image processing, parameter measurement and calculation can be achieved, the input cost is low, and the engineering application value is high.

Description

technical field [0001] The invention relates to the field of machine vision measurement, and relates to a spur gear geometric parameter measurement system and method, in particular to a machine vision-based large spur gear geometric parameter measurement system and method. Background technique [0002] In the context of intelligent manufacturing, fast and high-precision measurement of gears is the key to ensuring the quality of intelligent manufacturing of gear products. Most of the existing gear measurement equipment is contact measurement, and most of the measurement equipment is aimed at small and medium modulus spur gears. For large spur gears, there is no very convenient measurement method. With the rapid development of machine vision, relevant theories and industrial applications are becoming more and more mature. It is widely used in the fields of size detection, defect detection and target recognition, and the research on gear vision measurement technology has also b...

AI Technical Summary

Problems solved by technology

If only pixel-level edge detection is performed, the integer coordinate position of the edge can only be located, resulting in limited measurement accuracy of the measurement system

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