Image reading apparatus.

摘要

An image reading apparatus includes a plurality of linear sensors (15) for reading an image of a document. Each linear sensor reads a different portion of a line of the document in a divided manner. A plurality of clamp circuits (75) control black levels of signals generated by the plurality of linear sensors to be a black reference level. A plurality of multipliers (74) control white levels of signals generated by the plurality of linear sensor means which are level-controlled by the clamp circuits (75) so as to be a white reference level.