Patent ID: 7755805

Claim:
An image reading apparatus comprising: a feeder adapted to feed an original through a reading position in a sub scanning direction; a light source adapted to illuminate an original fed through said reading position; a reading device that is movable, and adapted to read image on the original in a main scanning direction in a state said reading device is stationary during said feeder feeds the original through said reading position in said sub scanning direction; a first reference member which is provided at outside of said reading position; a second reference member which is provided at said reading position; and a correction device adapted to correct an image signal obtained by reading the original on the basis of a first signal obtained by reading said first reference member by said reading device and a second signal obtained by reading said second reference member by said reading device during the interval between two successive originals conveyed to the reading position by said feeder, wherein said correction device corrects the image signal based on said second signal at a plurality of points of said second reference member in said main scanning direction.