Geometrical Size Detection on Key Contours of Safety Seat Base

Abstract

According to the plastic base without clear benchmark, the contour features are extracted by the image processing method such as image matching and feature extraction. With the reference of the waist groove, the measuring coordinate system is established. The coordinate transformation relation is determined by the calibration of visual inspection system. Thus, the geometric relation of the arc groove with respect to the measuring coordinate system is obtained. The geometric dimensions of the safety seat base are measured. The experiment result shows that the relative error of measuring the waist-shaped groove’s width is 2.7%, the one of measuring the length is 2.1%. And the relative error of measuring the arc-shaped groove’s width is 0.7%.