Canon iR8500 - Auto Density Adjustment (AE)

CHAPTER 2 NEW FUNCTIONS
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COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
d. 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 (Not executed if AE is selected).
F02-503-03
5.3.3 Auto Density Adjustment (AE)
a. Outline
As in the case of a newspaper, some originals have a dark background. Auto density cor-
rection is executed to reproduce the information (text, graphics) of such originals by remov-
ing the background.
This adjustment is enabled in density auto mode or when text mode is selected and data is
processed by the ABC circuit.
0 pixel
7450 pixels
Edge gain correction plate
Standard white plate (for shading)
Copyboard glass
Reading
glass
Main scanning
direction