Patent ID: 7460284

Claim:
An image scanning system comprising: a light source for illuminating a document; a plurality of line sensors for receiving light reflected from the document and outputting signals corresponding to respective color components of the received light; a selection device for selecting between 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 in motion and, wherein the second scanning mode allows the document to be scanned by the plurality of line sensors while the document is stationary; a color registration error correction device for correcting a color registration error between the signals output from the respective line sensors; and a control device for selecting, depending on the scanning mode selected by the selection device, a correction value used by the color registration error correction device to correct the color registration error; and an image processing device for detecting a black character included in the signal corrected by the color registration error correction device.