LAVER DEFECT INSPECTING APPARATUS

摘要

PURPOSE:To compensate fluctuation in transmitted light amount of laver itself and correctly detect whether or not an opaque foreign material mixed in the laver exists. CONSTITUTION:An analog image signal (a) of a piece of laver 10 passing through a carrier part 8 at a constant speed is output from a one-dimensional camera 1 and converted into a digital image signal (b) in an image acquisition part 2. A tip detecting part 3 senses the tip of the passing laver 10, and a total sum of image signals of scanning lines of a predetermined number of times is divided by a number of pixels in an entire effective field of view in an average level calculation part 4 to have an image average level (e) calculated. An image slice level (f) is set in a slice level setting part 5, binary image signals (c) are output in an image binary-coding decision part 6 and whether or not an opaque foreign material has mixed into the laver 10 is determined in a defect inspection and decision part 7.