Patent ID: 9426311
Filing Date: 2016-08-23
CPC Classification: G06K,H04N

Claim Text:
1. An image forming apparatus that performs double-side printing, the image forming apparatus comprising: an expansion/contraction ratio calculation unit that calculates a value of a ratio of expansion or contraction of a printing medium at a time of printing a second surface as compared with that at a time of printing a first surface; a storage control unit that causes a storage unit to hold the calculated value of the ratio of expansion or contraction while updating the value every time a new value is calculated; and a magnification correcting unit that obtains a difference between a newly calculated value of the ratio of expansion or contraction and a value that has been held b the storage unit until the new value is calculated, and determines whether or not the difference is within a predetermined range, corrects magnification of an image to be printed on the second surface using the newly calculated value of the ratio of expansion or contraction when the difference is within the predetermined range, and corrects the magnification of the image to be printed on the second surface using a different value than the newly calculated value of the ratio of expansion or contraction when the difference exceeds the predetermined range.