2-20
COPYRIGHT © 2005 CANON ELECTRONICS INC. CANON DR-2580C FIRST EDITION APR. 2005
CHAPTER 2 FUNCTION & OPERATION
4) Edge
Emphasis
Edge emphasis is a kind of processing
which emphasizes the brightness change
in order to make the image appear sharp.
(Figure 2-509)
Output
White
Black
White
Black
1 picture element
Edge portion
Edge portion
Before edge emphasis
After edge emphasis
Figure 2-509
The processing is performed by compar-
ing the data in the conversion table pro-
vided for performing edge emphasis, with
the target picture element data (a). (Figure
2-510)
The stages in edge emphasis can be
changed by changing the conversion table
and reproduction ratio (B) of the conver-
sion table.
For example, if the target picture element
data is increased fourfold and the other
four points multiplied by-1, the overall
brightness will remain unchanged.
Target picture
element
Conversion table
Output
Target picture
element (a)
Sub-scanning
direction
Main-scanning
direction
-a
0
0
4a
-a
-a
-a
0
0
: 1~64
32
B
B
Figure 2-510
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