This paper presents an automatic detection system for aeronautic rivets based on image recognition. The working process and principle of the system are introduced and the hardware components of the system are given. Then

based on the analysis of evaluation function of image definition captured by CCD camera

an autofocusing method which can be applied in different rivets detection is proposed. Finally

through the analysis of image filter processing and the verification of edge-detection algorithm

the scheme from edgedetection of rivets images to feature extraction is established and the main function interfaces of the system are designed.