Ipu (Image Processing Unit); Overview - Gestetner A193 Service Manual

IMAGE PROCESSING

2.4 IPU (IMAGE PROCESSING UNIT)

2.4.1 Overview

S B U
M S U
L D
Unit
Printer
controller
The image data from the SBU (Sensor Board Unit) is sent to the IPU (Image
Processing Unit) IC on the BICU board, which can perform any of the
following processes on the image data:
1. Auto shading
2. Filtering (MTF and smoothing)
3. Magnification
4. γ correction
5. Grayscale processing
6. Binary picture processing
7. Error diffusion
8. Dithering
9. Video path control
10. Test pattern generation
The image data then goes to either the LD controller (GAVD) or the FCI
depending on the selected copy modes.
(A193)
+
Tx
IPU
C P U B U S
+
G A V D
R
x
Fax Controller
2-8
BICU
Fax controller
C P U
FCI
1 bit
Data
8 bit
+
Data
A193D527.wmf
SM