| 摘要 |
When an original conveying unit that rotates about a rotation center 901 reaches an opening angle 906, an image is read using a line sensor, and a detected object is determined as being white dust on a platen glass. When it further reaches an opening angle 908, an image is again read using the line sensor, and a detected object is determined as being black dust on the platen glass. When it further reaches an opening angle 910, an image is again read using the line sensor, and a detected object is determined as being dust on a reference white plate with which the original conveying unit is provided in a state of facing a reading position where the line sensor performs reading.
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