DEVICE AND METHOD OF CORRECTING DARK LINES OF A SCANNED IMAGE

A device and method of correcting a scanned image generated by a scanner for eliminating dark lines. The scanner is driven to scan a calibration paper. Using the scan data, a plurality of base scan data corresponding to various positions of a scanning line are calculated by averaging the scan data at the same position. Further, a plurality of reference scan data corresponding to various positions of the scanning line are calculated in response to the base scan data with a numerical processing procedure, such as the left-/right-reference algorithm or the curve approximation algorithm. The difference between the base scan data and their corresponding reference scan data is compared with a defect level to mark the defect positions. Finally, the output of the scanned image sensed by the image scanner is corrected by using the defect information, thereby eliminating dark lines.