Patent ID: 9699346
Date: 2017-07-04
CPC Classifications: H04N

Claim:
1. An image reading apparatus comprising: a first conveyance unit structured to convey a sheet; a first image reading unit located in a downstream side of the first conveyance unit in a conveying direction, and structured to read the sheet for each line in a sheet width direction and output image data; a second conveyance unit located in a downstream side of the first image reading unit in the conveying direction, and structured to convey the sheet; an arithmetic unit structured to calculate a nonlinear magnification variation based on the image data read by the first image reading unit with respect to the sheet on which a predetermined pattern is formed; an image reading control unit structured to correct a reading time per line of the first image reading unit based on the calculation result by the arithmetic unit; and an image correction unit structured to perform, in accordance with correction of the reading time, image correction of the image data of the first image reading unit which has been corrected by the image reading control unit with respect to the reading time.