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COPYRIGHT © 2005 CANON ELECTRONICS INC. CANON DR-2580C FIRST EDITION APR. 2005
2-15
CHAPTER 2 FUNCTION & OPERATION
4)
Image Resolution Conversion
a) Main-Scanning Direction
This machine enables outputs from the
CIS PCB to be converted into 600dpi or
300dpi data. In case that the resolution
selected is the 600/400dpi mode, it
produces 600dpi outputs. On the other
hand, in case that the resolution is set
at 300dpi or less, 300dpi outputs are
produced.
When 600 or 300dpi data are produced,
this machine can convert the resolu-
tions of those data by averaging them.
The image resolution conversion by
averaging is sometimes called
“smoothing.”
Averaging method conversion enables
the data to be smoothly transformed
much better than that by thinning-out
method, resulting in reducing the oc-
currence of Moire patterns.
Averaging is especially useful for
low-resolution photographs.
The data are averaged according to
the resolution applied when the basic
data of each picture element are con-
verted.
Figure 2-501 shows the aspects of
300dpi image data and the image data
averaged to 150dpi data.
A
A
A
A
A
A
1st line
2nd line
3rd line
1st line
2nd line
3rd line
(A+B)/2
(A+B)/2
(A+B)/2
(C+D)/2
(C+D)/2
(C+D)/2
(E+F)/2
(E+F)/2
(E+F)/2
(G+H)/2
(G+H)/2
(G+H)/2
4th line
5th line
6th line
B
B
B
B
B
B
C
C
C
C
C
C
D
D
D
D
D
D
E
E
E
E
E
E
F
F
F
F
F
F
G
G
G
G
G
G
H
H
H
H
H
H
•
300 dpi
•
150 dpi
Figure 2-501
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