Automatic Visual Inspection System of Gas Valve’s External Taper Thread Based on Image Domain

Abstract

The failure of the gas valve’s external screw taper thread is a very serious problem which may result in accidents. Routine inspection on the threads are thus necessary. The efficiency of traditional manual testing methods can not meet the production requirements. An automatic visual inspection system for gas valve’s exteranl screw taper thread was presented in the paper. The system consists of a high-performance 200 megapixels CCD camera, a LED backlight and a holder of gas valve. Through image acquisition, image processing, edge detection and feature dimension measurement, the system can effectively measure the parameters of taper thread such as angle of thread, depth of thread, taper angle of thread on image domain. It can meet the testing requirements of the external screw taper thread and has wide application perspective.

Design of an All-in-One Drowning Prevention and Monitoring System

“…4. The PyCharm tool is used to write the main program, which calls the Open Cv library for image preprocessing and image feature extraction [10]. Open Cv has image processing functions that cover most of the application areas of computer vision, including feature detection, feature matching, image filtering, image segmentation, and other rich image processing and computer vision functions.…”