| 摘要 |
PURPOSE:To detect quickly the shape and the position of an object with a high precision, by making only the shade image of the object incident to a photographing device as a black-level picture signal and making only the direct reflected light incident to this device as a white-level picture signal. CONSTITUTION:A substrate 2 which an object 1 to be detected is put on is illuminated with a certain brightness from the direction, which is inclined left at 45 deg. from the perpendicular by a light source 3. An image pickup camera 4 is arranged in the direction inclined right at 45 deg. from the perpendicular. The light source 3 is so set that images of the object 1 and the substrate 2 are taken as white-level pictures having the same gradation. Only the shade part of the object is taken out as the black-level picture signal from the image pickup camera 4. Thus, the position and the shape of the object are detected with a high precision only by the comparison of two densities of logical ''1'' and ''0''. |
