IMAGE READING APPARATUS HAVING FLOW-READING MODE IN WHICH SHEET BEING CONVEYED IS READ

摘要

An image reading apparatus may be in a state where a foreign material detection process cannot be completed for all reading position candidates before a sheet arrives at a conveyance roller. In such a state, the image reading apparatus performs the foreign material detection process and a position determination process only on reading position candidates which are part of all reading position candidates. The image reading apparatus determines a reading position candidate with fewest foreign material images from among the reading position candidates for which the foreign material detection process has been completed, as a sheet reading position.

主权项

1. An image reading apparatus comprising:
a conveyance unit configured to convey a sheet; a reading unit configured to read, in a reading position, the sheet being conveyed by the conveyance unit, based on a set reading mode; a foreign material detection unit configured to detect a position of a foreign material in the reading position, based on image data output from the reading unit while the sheet is not conveyed to the reading position; a moving unit configured to move the reading unit, to change the reading position; a number determination unit configured to determine a number of performing a detection process of causing the moving unit to change the reading position and detecting the position of the foreign material, before the reading unit starts reading the sheet based on the set reading mode; and a position determination unit configured to determine the reading position for reading the sheet based on a foreign material detection result of the foreign material detection unit by causing the detection process of causing the moving unit to change the reading position and detecting the position of the foreign material to be performed less than or equal to the number determined by the number determination unit before the reading unit starts reading the sheet.