Patent ID: 6304323
Filing Date: 2001-10-16
Classification: G01N

Abstract:
A method for detecting a defect in a bottle, comprising:imaging a barrel portion of a bottle with a CCD camera based on light which has passed through a light shield plate having a plurality of oblique slits and said barrel portion;generating from an image generated by the imaging step a binary image having a striped pattern of bright and dark striped areas within a window having a certain area;scanning said binary image in a longitudinal direction of said barrel portion to generate a labeled image in which labels are assigned to the bright and dark striped areas of the striped pattern, respectively; andscanning said labeled image in a longitudinal direction of said barrel portion and determining a defect in said barrel portion if there is a striped area of one label which is not in contact with any one of sides of said window or if a striped area of one label appears more than a preset number of times along a scanning line.