| 摘要 |
PURPOSE:To determine the area of inspection of an object of inspection stuck on a glass plate. CONSTITUTION:An object W of inspection is illuminated by an illuminating part 4, an image of a part of the object W of inspection is picked up by an image pickup part 5 and image data are inputted to an image processing part 6. The image processing part 6 determines an average density value of the image data near the center of the object W of inspection which are inputted, and sets a reference density area value of some range. Moreover, a part of the image data on a side of the object W of inspection is divided into strip- shaped areas and the average density value of the strip-shaped areas is determined. This average density value is compared with the reference density area value and a plurality of edge points of the side are determined. Subsequently, regression lines are determined from the edge points in a plurality and an area surrounded by the regression lines is recognized as the area W of inspection. |
