Abstract:In order to meet the requirements for precise measurement of the bladeshaped hole of the stator of aeroengine,a noncontact fouraxis bladeshaped hole measurement system was designed based on the method of machine vision.The system was mainly composed of threeaxis motion mechanism,highprecision airfloating turntable,industrial camera,light source,fixture and industrial PC.In order to obtain the coordinate value of the edge of the bladeshaped hole,the collected image was subjected to median filtering,binarization,foreground area separation,area selection,graphics processing,edge extraction,edge coordinate value extraction and coordinate transformation on the host computer,and the measurement of line profile of bladeshaped hole was finally realized.