Patent ID: 8514452
Filing Date: 2013-08-20
Classification: H04N

Abstract:
1. An image scanning apparatus comprising: an image scanner configured to read an image from an original sheet by scanning an image-formed surface of the original sheet with light in a main-scanning direction and convert light reflected from the image-formed surface into electricity using a photoelectric conversion element, thereby creating an analog image signal; an A/D converter configured to convert the analog image signal that is created by the image scanner into a digital image signal and output the digital image signal; a shading corrector configured to perform shading correction on the digital image signal that has been output from the A/D converter; a white member that faces a scanning surface of the image scanner; and a reference-white-data creator configured to create reference white data for the shading correction by scanning a surface of the white member using the image scanner, wherein an interval is provided between the image scanner and the white member to allow the original sheet to pass through the interval, and the image scanning apparatus further comprises an interval controller configured to perform interval control of decreasing the interval between the scanning surface of the image scanner and the surface of the white member when the reference-white-data creator creates the referential white data.