Image processing apparatus and the method of correcting the inclination

An image processing apparatus for correcting the inclination of image data while reading originals as image data by electric scanning, comprising:

• an inclined angle detecting means for detecting an inclined angle of an original;
• a first line shifting means for shifting the image data in the main-scanning direction by a specific number of lines in a shifting amount corresponding to the inclined angle detected by the inclined angle detecting means;
• a first image memory for storing the image data shifted by the first line shifting means;
• a first rotating means for interchanging the main-scanning direction and the sub-scanning direction by rotating the image data stored in the first image memory by 90 degrees or 270 degrees;
• and,
• a second line shifting means for shifting the image data, rotated by the first rotating means, in the main-scanning direction by the specific number of lines in the shifting amount corresponding to the inclined angle detected by the inclined angle detecting means.