Detect of scratches in spherical lenses, for light reflected under Fourier descriptors / Detecção de riscos em lentes esféricas, por luz refletida, através de descritores de Fourier
AUTOR(ES)
Robson Barcellos
DATA DE PUBLICAÇÃO
2007
RESUMO
This work presents a methodology for inspection of spherical organic ophthalmic lenses during the polishing process. The methodology encompasses the capture of an ultraviolet image of the lens under inspection by a CCD video camera and associated processing of the image to discriminate between scratches on the lens and artifacts that can appear on the image. Fourier descriptors were used to detect the existence of scratches. Special attention was given to illumination which is a determining factor in grabbing an image with good quality. The results show that the method is efficient and that it can be used in the lens manufacturing process.
ASSUNTO(S)
riscos feature vector iluminação scratches fourier descriptors organic lenses vetor de características descritores de fourier lentes orgânicas ultraviolet ultravioleta illumination
