Thread image processing technology research based on combination of edge detection and sub-pixel positioning

Fang Li

Abstract

This paper introduces a new method for auto-measuring parameters of thread based on image processing techniques. According to the characteristics of the thread, this paper select median filtering method, Histogram edge detection and sub-pixel positioning and other image processing methods. Then the parameters of thread, such as the pitch diameter, half of thread angle and the pitch of thread were obtained, an example image was introduced to prove this method. It is very useful in improving the detection precision of thread.