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    • 10. 发明专利
    • MARK READER
    • JPH0454577A
    • 1992-02-21
    • JP16138690
    • 1990-06-21
    • MEIDENSHA ELECTRIC MFG CO LTD
    • IGURA KOJITAKAHASHI TSUNEYOSHIABE KIYOHIDENOMURA SATORUKASHIWABARA ISAO
    • G01B11/24G06K7/10
    • PURPOSE:To accurately read the marks put on the work surface like a corrugated cardboard box, etc., by deciding the presence of the marks when the measurement value of the picture elements equivalent to the marks included in a measurement area exceeds a prescribed level. CONSTITUTION:When a sensor 7 detects a work 1, an image process 14 fetches the image output of a video camera 6 and produces three windows to detect a mark entry means 3 on the surface of the work 1. Then a measurement area 20 is set in the frame 3 and the number of picture elements equivalent to a mark 5 are measured. When the measured number of picture elements exceeds a prescribed level, the presence of the mark 5 is decided. In this case, the position of the frame 3 is already known on the work 1 and therefore the frame 3 is included in the view filed of the camera 6. At the same time, the area 20 is also set on a fetched image based on the position of the frame 3. Then the number of picture elements equivalent to the mark 1 exceeds a prescribed level in the area 20 as long as the mark 5 is written. As a result, the marks put on the surface of a work like a corrugated cardboard box, etc., can be correctly read.