AUTOMATIC STAIN DETECTING METHOD, AUTOMATIC CLEANING METHOD AND AUTOMATIC CLEANING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a method of immediately detecting stains of a light source inducing identification failure when images of an examining object are picked up by a CCD camera to identify the color, etc., of the object, a method of automatically removing the stains on the basis of the detection of the stains, and an apparatus for automatically removing the stains. SOLUTION: A periodic image pickup operation is carried out when there is no examining object. The brightness of each pixel is compared with a reference value and binarized. When the rate of the binary value is within a predetermined range, it is judged that a stain occurs, and a stain removing means is actuated.