Method for determining the amount of skew of image, method for correcting the same, and image data processing system

摘要: Method for determining and correcting the amount of an skew image which may be read by reader, preferably one with automatic paper feeding device. Information dependent on angle is obtained in a plurality directions respect to data determined based information obtained. Measurement performed two or more stages (or steps). At first stage, measurement within narrow range angles including reference direction. If no detected range, then again at second stage wider angles. omitted. With determined, rotated accordance cancel skew. No correction if detection does not result either stage. Preferably, omitted falls very small