| 摘要 |
PURPOSE:To recognize the defect such as flaws accurately so tht noise and the like is discriminated, by setting a pattern, which is used for comparison with a reference picture pattern, in a small size. CONSTITUTION:A binary coded pattern comprising picture elements of 511X511 is obtained by picking up the image of an object and stored in a memory. Then, a partial picture pattern comprising the picture elements of 8X8, which is located at the upper left corner of the picture is read from the memory and compared with a reference picture pattern for every picture element. When the comparison is finished, the reading position is shifted in the horizontal direction by every picture element as shown in Figures (c) and (d). When the processing at the rightmost end (e) is finished, the position is shifted in the vertical direction as shown by (f). By the same process, the comparison and the defect recognizing process are performed on the entire picture. When a flaw like an (m) in the Figure is present and the reading position is at (j), the part is extracted as shown by (a) in Figure 4. When this is compared with the reference picture pattern in Figure 5, the number of the agreed picture elements 16 is detected. For the partial picture pattern (k), wherein only the image caused by noise is present, the number of the agreed picture elements is very few as shown by (b) in Figure 4. Therefore, the defect and the noise can be accurately discriminated. |
