Patent ID: 8174734

Claim:
An apparatus for correcting a scanned image by aligning, in a sub-scan direction, first image data and second image data corresponding to two of a plurality of sensor lines, respectively, when the plurality of sensor lines each extending in a main scan direction and arranged at intervals in the sub-scan direction is scanned relative to a scan object in the sub-scan direction such that each of the plurality of sensor lines scans image data at a predetermined line interval in the subs-scan direction, the apparatus comprising: a delay circuit configured to delay the first image data by a delay amount corresponding to an integer multiple of the line interval; an interpolation circuit configured to perform an interpolation computation responsive to interpolation coefficients with respect to two or more lines included in the first image data delayed by the delay circuit; and a control circuit configured to set the delay amount to the delay circuit and the interpolation coefficients to the interpolation circuit, wherein the control circuit is configured to set the delay amount to an amount corresponding to integer m smaller than integer n and set the interpolation coefficients such that the interpolation computation becomes equivalent to a computation introducing a delay equal to n−m lines if an interval between the first image data and the second image data is n times the line interval.