Oce 3121 Technical & Service Manual page 284

Direct
Document
(image data)
(writing)
Line memory
(reading)
Copy
Reproduction All data is written
ratio in for- 'as-it-is' into memory.
ward scan-
ning direction
Reproduction
ratio in reverse
scanning
direction
Shift Processing
Samples of image shifting, and conceptual outlines of shifting in the forward
scanning direction and in the reverse scanning direction.
508 TSM Océ 3121
Reduce
To reduce to 1/2, every
other data unit is
skipped during the
writing into memory.
The speed at which the
scanner is moved is
increased. This
increases the width of
the scanning of the doc-
ument in relation to a
single pixel.
Enlarge
To enlarge to 200%, all
data units are written
'as-it-is' ,but the data
units are read twice
when reading from
memory.
The speed at which the
scanner is moved is
decreased. This
decreases the width of
the scanning of the doc-
ument in relation to a
single pixel.
Functional description