Canon GP215 Service Manual page 90

3. OPERATIONS AND TIMING
b. Shift Processing
Figures 3-309, -310, and -311 give samples of image shifting and conceptual outlines of shifting in
main/sub scanning direction.
<Original>
Main scanning
direction
a b c
<Copy>
a b c
a b c
Shifting in Main Scanning Direction
a b c
Not read
a b c
Reading starts
with this pixel.
Memory>
a b c
Figure 3-310
3–36
COPYRIGHT © 1996 CANON INC.
<Copy>
Principle :
The position or the timing
at which the original
illuminating system is started is
varied to shift the position of
the image.
Figure 3-309
Main scanning derection
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
Shaft in main scanning direction
a b c
Principle : When data for a single scanning line is
read from line memory, reading is started
with a midway pixel or the timing at which
the data of the first pixel is read is delayed,
thereby shifting pixel position.
a b c
Reading starts with this pixel.
a b c
a b c
a b c
Main scanning direction
Not read.
Figure 3-311