An evaluation method for free- form curve profile based on the distribution characteristics of directed profile error

Abstract

This paper describes an evaluation method of free-form curve profile, which uses the distribution characteristics of directed profile error. This method can express the deviation trend of curve contour and the quality of overall contour to a certain extent. It adopts the concept of directed profile error (DPE), which can quantify the feature of the difference between the ideal curve and the actual curve, including size and direction of deviation. To eliminate systematic errors, the calculation of DPE mainly includes two steps, curve registration and curve fitting. Aiming to evaluate the free-form curve profile, this paper analyzes the degree of concentration and dispersion of DPE. The simulation experiment and actual measurement experiment is designed to test the effectiveness and applicability of this method. From the experimental results, this method can be used to describe the profile features of free-form curves better and meet the needs of quality assessment.