| 摘要 |
When an auto document feeder feeds an original to an original image reading platen, a CCD line sensor reads the original along the main scanning direction perpendicular to the feeding direction of the original. A string detection circuit detects a streak parallel to the feeding direction in the image. A string correction circuit corrects the detected streak. In particular, for a predetermined number of sub-scanning positions that are located in the same main scanning position as the main scanning position at which the streak has been detected by the string detection circuit and that exist subsequent to the sub-scanning position at which the streak has been detected, correction is performed by the string correction circuit even when no streak is detected by the string detection circuit. |
