The problems of automatic defects inspection system in existence are described.Meanwhile

an all-purpose automatic on-line judging system for defects is presented.The key techniques

including on-line system design as well as implementation of location

quantitative and qualitative analysis

are analyzed.The 3D location technique based binocular parallax for defects is brought forward.The techniques of defecting region segmentation

edge detection

contour tracking as well as characteristic parameters computing are discussed.Finally

combining with currency standards

facture technics of object and scanning mode

the characters of defects are judged using the data from locating and quantitative analysis.