Scratch inspection of spectacle lens based on fuzzy logic

Abstract

In this paper, we propose an intelligent method to detect small scratches from eyeglasses using fuzzy logic. Inspecting scratches of eyeglasses largely depends on the native eye exam that may lead providing defected eyeglasses to customers at optician's shop since those small scratches are often occurred in the process of transportation rather than that of production. Our method computes the possibility of ill-effect by scratch on glasses with membership degree of the scratch size and that of distance between the center and the scratch from candidate scratched areas extracted in the pre-processing phase. Our method is applied to CHEMI MID HL HM dioptric lenses in experiment and it is verified that the proposed method is sufficiently effective by real optician's evaluation. © 2013 Springer Science+Business Media Dordrecht.