关键词: 机器视觉, 透视投影, 非线性模型, 误差分析

Abstract: In the measurement system of gear chamfering machine vision, contour measurement is the key factor to realize gear center positioning. Traditional lens imaging, due to the principle of perspective projection characteristics, will cause the measuring error of gear profile circle diameter, and then affect the positioning accuracy of the contour circle. The nonlinear model of perspective projection error is established, and the error analysis and compensation of the measurement of the diameter of the gear profile of different thickness are made. The experimental results show that the method has a certain practical value, which meets the requirements of gear profile measurement.

Key words: machine vision, perspective projection, non-linear model, error analysis