Patent ID: 6597804
Filing Date: 2003-07-22
Classification: G01N

Abstract:
A method for testing the reliability of an apparatus which checks a large number of empty bottles of the same type made of transparent material for freedom from defects and the absence of foreign bodies the method comprising:scanning an image of each empty bottle pointwise by means of a recognition apparatus; generating a feature signal for each empty bottle, which is based on brightness distribution (histogram); comparing the feature signal with a threshold value; conducting a test bottle to the checking apparatus after a number of empty bottles; checking the feature signal of the test bottle to determine if the feature signal of the test bottle corresponds to a pre-set reference value; and wherein the feature signal contains details of the distribution of the light-dark contrasts and similarly the reference value contains details of the contrast distribution of the light-dark distributions and when the feature signal of the test bottle is checked, it is also checked if the details of the contrast distribution contained in the feature signal correspond to those of the reference value.