Patent ID: 7502147

Claim:
An image position correcting method comprising: a reference image forming step in which an image forming section forms an image on a sheet based on a first reference image, the first reference image including an image which is used for measurement of an image formation position error and an image formation scaling factor error; a correction image reading step in which an image reading section reads, as an correction image, the image of the sheet along with an image of a reference object based on which a second reference image is formed, the second reference image including an image for use in measurement of an image read position error and an image read scaling factor error, the sheet and the reference object being placed at respective predetermined positions on the original platen; an image reading section error measuring step in which a control section measures the image read position error and the image read scaling factor error in the image reading section, based on a difference between the second reference image and the image of the reference object contained by the correction image; and an image forming section error measuring step in which the control section measures the image formation position error and the image formation scaling factor error, based on a difference between the first reference image and the image of the sheet contained by the correction image with reference to the measured image read position error and image read scaling factor error.