Patent ID: 8081357

Claim:
An image scanning apparatus comprising: a light source configured to illuminate a document; a plurality of line sensors configured to receive light reflected from the document and output signals corresponding to respective color components of the received light, the plurality of line sensors being disposed in parallel with each other; a selection device configured to select one of a first scanning mode and a second scanning mode, wherein the first scanning mode allows a document to be scanned by the plurality of line sensors while the document is moved in a sub scanning direction perpendicular to a main scanning direction parallel with the plurality of line sensors and, wherein the second scanning mode allows the document to be scanned in the sub scanning direction by the plurality of line sensors while the document is stationary, wherein the order in which the plurality of line sensors receive the light reflected from the document in the first scanning mode is opposite to the order in which the plurality of line sensors receive the light reflected from the document in the second scanning mode; and a color registration error correction device configured to correct a color registration error between the signals output from the respective line sensors, and wherein the color registration error correction device corrects a signal of interest pixel based on a signal of an adjacent pixel and a first correction value in a case where the selection device selects the first scanning mode and corrects the signal of interest pixel based on the signal of the adjacent pixel and a second correction value in a case where the selection device selects the second scanning mode.