Development of a Trajectory Planning Algorithm for Moving Measuring Instrument for Binding a Basic Coordinate System Based on a Machine Vision System

This article describes a solution for automating measurements on CNC machines equipped with automatic measurement tools using a vision system that simulates stereoscopic vision. The proposed method of measurement allows non-contact determination of the approximate position of the workpiece on the machine to fill in the parameters of measuring cycles. A three-stage algorithm for image processing by a software module of such a system is described, including recognition of the area with the workpiece, automatic correction of input images for successful contour recognition, determining of the contours of the workpieces and their geometric parameters, as well as calculation of the approximate dimensions of the workpieces relatively to the marks applied to the machine worktable beforehand. The calculated dimensions must be transmitted to the CNC system of the machine to run a parameterized program that calls a measuring cycle that clarifies the position of the workpiece on the machine. A model of the vision system has been implemented and tested.