Edge Gain Correction (Adf In Use) - Canon iR2200 Service Manual

CHAPTER 3 IMAGE PROCESSING SYSTEM

3.2.4 Edge Gain Correction (ADF in use)

In stream reading with the ADF in use, the No. 1 mirror base is fixed in position. To
check for changes in the intensity of the scanning lamp, the edge gain correction plate (gray;
mounted at the edge of read position) is read, and a gain that enables the attainment of a
specific intensity is computed.
The result is used to correct the data which otherwise would be affected by changes in the
intensity of light.
3-6 R
COPYRIGHT © 2001 CANON INC.
Edge gain correction plate
1 pixel
Copyboard glass
Main scanning
direction
Reading
glass
7450 pixels
Standard white plate (for shading)
F03-302-02
2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001