| 摘要 |
PROBLEM TO BE SOLVED: To detect quickly and surely a defective part of an image to be inspected by using a simple method and to surely prevent judgment error due to unclear images by adjusting brightness. SOLUTION: A CCD line sensor camera 2 for taking an image data of a keyboard on the display surface, a brightness adjusting part 331 for adjusting the brightness of the image data which was taken-in, a first storage part 31 where a reference image data a after brightness-adjustment is stored, a second storage part 32 where a real image data after brightness adjustment is stored, a judgment part 332 where a real image made into a graphic based on the reference image data is divided into arbitrary small regions, and it is judged, for each small region, whether a region corresponding to the measure of small region is in a corresponding near region of the reference image made into graphic based on the reference image data or not, and a first defect detecting part 333 where if it is judged that the region corresponding to the measure of small region is not in a corresponding near region of the reference image, the region of real image corresponding to the small region is detected as a pattern defect region, are provided. |
