Patent ID: 9332153
Filing Date: 2016-05-03
CPC Classification: H04N

Claim Text:
1. An image reading device comprising: an image reading portion configured to read image data from a document conveyed to pass through a predetermined reading position; a reading control portion configured to read the image data for one line in a main scanning direction from a first reference member placed being opposed to the image reading portion and having a predetermined reference color; a storage portion in which initial reference data for one line is stored, the initial reference data for one line being generated based on the image data for a plurality of lines read from a second reference member by using the image reading portion while a surface of the second reference member having the reference color is moving in a sub scanning direction perpendicular to the main scanning direction at a position opposed to the image reading portion; a reference data generation portion configured to generate reference data based on the image data read by the reading control portion and a high-frequency component of the initial reference data stored in the storage portion; and a shading correction portion configured to perform shading correction for the image data read from the document by the image reading portion, based on the reference data generated by the reference data generation portion.