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COPYRIGHT © 2005 CANON ELECTRONICS INC. CANON DR-2580C FIRST EDITION APR. 2005
CHAPTER 2 FUNCTION & OPERATION
c) Advanced
Text
Enhancement
In this mode, a histogram of brightness
level for each block within the scanned
data is calculated, and an optimum slice
level is determined to binarize the picture
elements.
Binarizing in this way removes the back-
ground, for example, from behind text
printed on a background.
For example, as shown in the image in
Figure 2-516, a histogram for each block
is calculated, and the optimum slice level
is determined to binarize the picture ele-
ments.
Slice level
Brightness level
Black
White
F
requency of appear
ance
Figure 2-516
6) Automatic Size Detection
In case that the automatic size detection
mode is selected, an image data with the
maximum width and the length detected
by the registration sensors in the feed di-
rection is read.
The maximum outside frame is detected
from the image data which has been read.
The inside of the data is defined as the
document size and the margins are re-
moved.
ABC
ABC
Registration
sensors
Maximum size
Figure 2-517
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