| 摘要 |
PURPOSE:To offer an accurate positioning method whose reliability is high by a method wherein the outside-shape contour of an image picked up by using a PV camera is extracted or the projection distribution of a component region is found and the approximate position of the image is then decided. CONSTITUTION:A silhouette image is taken into a memory at an image processing device when the image is input. Then, it is approximated to a polygon by executing a square approximation treatment. On the basis of image contour information obtained by the treatment, its recessed parts are filled; and an outside-shape contour is changed to a protruding figure. A rectangle which is overlapped best with the silhouette image of a component is selected. For example, in the case of the image of QFP, it is positioned by drawing measuring lines in parallel with individual sides of the rectangle and on the inner side by a prescribed amount which has been given in advance. In the case of a square ticket or the like, a positioning window is set on the inner side by a prescribed amount from corners of a circumscribed rectangle; then, its position and its angle can be decided by synthesizing all positions computed by using the window. |
