Edge Emphasis / Smoothing Process; Magnification Ratio Process - Canon GP160F Service Manual

C.

Magnification ratio process

The magnification ratio in horizontal scanning direction (drum axis direction) is
changed by line skipping (for reducing) when writing the image signal to the line memo-
ry, or double scanning (for enlarging) when reading out from the line memory.
The magnification ratio in the vertical scanning direction is changed by increasing
the speed of the mirror mount's movement (when reducing), or reducing the movement
speed (when enlarging).
D.

Edge emphasis / smoothing process

When the character mode is selected on the control panel, edge emphasis process-
ing takes place. When the photo mode is selected, smoothing processing takes place.
When edge emphasis processing takes place, it is possible to emphasize an image's
gradation variations thus producing a more distinct image. Conversely, the smoothing
process softens the image's gradation variations, and produces a softer image. When
copying a photo, the smoothing process makes the moiré effect less conspicuous.
Black 255
200
100
Horizontal scanning direction
0
White
Smoothing process
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Black
255
1 pixel
200
100
Horizontal scanning direction
White
0
After output
Figure 4-304
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE PROCESSING SYSTEM
After output
Black 255
200
100
Horizontal scanning direction
0
White
Edge emphasis process
After output
4-7