Image reading device and vertical stripe determination method

摘要

An image reading device includes a reading glass moving unit that moves a reading glass; a determining unit that determines whether or not a read image obtained by the sheet-through reading unit includes a vertical stripe which represents linear images continuous in the original carrying direction; a determining unit that, when a vertical stripe is formed, determines matching/mismatching of the positions of the vertical stripe in read images of an original carrying member which are obtained before and after moving the reading glass; a determining unit that, based on determination indicating mismatching, determines that a causing matter of the vertical stripe is present on the reading glass and, based on determination indicating matching, determines that a causing matter of the vertical stripe is present on a portion other than the reading glass; and a determining unit that determines the type of the causing matter.

主权项

1. An image reading device that includes a sheet-through reading unit in which a reading unit is fixed and image reading is performed through a reading glass while carrying an original, the image reading device comprising:
a reading glass moving unit configured to move the reading glass in a direction orthogonal to an original carrying direction; a vertical stripe formation determining unit configured to determine whether or not a read image obtained by the sheet-through reading unit includes a vertical stripe which represents linear images continuous in the original carrying direction; a vertical stripe position determining unit configured to, when a vertical stripe is formed, determine matching/mismatching of positions of the vertical stripe in read images of an original carrying member which are obtained before and after moving the reading glass; a causing matter location determining unit configured to, based on determination indicating mismatching performed by the vertical stripe position determining unit, determine that a causing matter of the vertical stripe is present on the reading glass and, based on determination indicating matching performed by the vertical stripe position determining unit, determine that a causing matter of the vertical stripe is present on a portion other than the reading glass; and a causing matter type determining unit configured to determine a type of the causing matter.