JP2007336455A5 - - Google Patents

Claims (5)

A first reading means for reading one surface image of the document,
Second reading means for reading an image on the other side of the document;
Based on data obtained by reading at least two different gradation patches on a reference document having a plurality of halftone gradation patches by each of the first and second reading means, the first reading is performed. Correction means for correcting the gain and offset of the reading characteristics of the second reading means so as to match the reading characteristics of the means;
An image reading apparatus comprising: Before Kiho positive means, an image reading apparatus according to claim 1, wherein the first and second reading means and said applying shading correction process for the original image data obtained by reading the manuscript. 2. The image reading apparatus according to claim 1, wherein the first and second reading units read a document image for each color of RGB, and the correction unit performs correction of gain and offset for each color of RGB . A control method for an image reading apparatus, comprising: a first reading unit that reads an image on one side of a document; and a second reading unit that reads an image on the other side of the document,
At least two or more different the gradation patches based on data obtained by reading by each of the first and the second reading means, the first reading on the reference original having gradation patches of a plurality of halftone A control method for an image reading apparatus , comprising: a correction step for correcting a gain and an offset of the reading characteristic of the second reading unit so as to match the reading characteristic of the unit . 5. The method of controlling an image reading apparatus according to claim 4, wherein the first and second reading means read an original image for each RGB color, and the correction step performs gain and offset correction for each RGB color .