Canon DR-9080C Service Manual page 58

CHAPTER 2 FUNCTIONS & OPERATION
5. Edge Emphasis
Edge emphasis is a kind of processing which
emphasizes light and shade in order to make the
image appear sharp. (Fig. 2-509)
White
Output
Edge portion
Black
Before edge emphasis
Density processing
comparing the data in the conversion table
provided for performing edge emphasis, with the
target picture element. (Refer to Fig. 2-510.)
The stages in edge emphasis can be
changed by changing the conversion table and
reproduction ratio (B) of the conversion table.
Target picture
element (density a)
Conversion table
2 - 34
1 picture element
Edge portion
Fig. 2-509
is performed by
Target picture
element (density a)
0 -a 0
-a -a
4a
0 -a 0
Main-scanning
direction
Fig. 2-510
COPYRIGHT © 2003 CANON ELECTRONICS INC.
White
Black
After edge emphasis
If the density of the target picture element is
increased fourfold and the density of the other
four points multiplied by -1, the overall density will
remain unchanged.
B
32
B : 1~64
CANON DR-6080/9080C REV.0 SEPT. 2003
Output