| 摘要 |
A cylindrical container inner surface tester which illuminates an opening of a test container. The test container is located at a predetermined position with its opening set levelly to capture the opening through a TV camera. The tester also detects black and white spots on the inner surface of the cylindrical container. This is accomplished by analyzing an image obtained by the TV camera using defect detecting means. The tester includes a frame memory which stores a multi-value continuous tone image signal as image data. The image signal is obtained by A/D-converting from a continuous tone image signal obtained by scanning the captured image. The tester also includes an area detecting unit which generates a binary image signal by binary-converting from a multi-value continuous tone image signal read by horizontally or vertically scanning the frame memory. This is accomplished using a predetermined threshold. The area detecting unit is also used to determine a test area. The test area falls within the area between the first rise point and the last fall point of each scanning line of the controlled binary image signal.
|
