| 摘要 |
A method for appearance inspection utilizes a reference image and an object image. Before determining a final reference image for direct comparison with the object image, the outlines of the reference and object images are extracted and processed in accordance with an error function indicative of linear or quadric deformation of the object image in order to derive error parameters including a position, a rotation angle, and a scale of the object image relative to reference image. The resulting error parameters are applied to transform the reference outline. The step of updating the error parameters and transforming the reference outline is repeated until the updated error parameters satisfy a predetermined criterion with respect to a linear or quadric transformation factor of the object image. Thereafter, the last updated parameters are applied to transform the reference image into the final reference image for direct comparison with the object image. |
