Ricoh B022, Руководство по обслуживанию, Страница: 68 / 878

IMAGE PROCESSING
B022/B027 2-8 SM
2.2.4 IPU (IMAGE PROCESSING UNIT)
Overview
The image data from the SBU goes to the IPU (Image Processing Unit) ICs on the
SBCU board, which carry out the following processes on the image data.
IPU-A
•
Auto shading
•
Pre-filtering
•
Magnification
•
Test pattern generation
IPU-B
•
Filtering (MTF and smoothing)
•
ID gamma correction
•
Grayscale processing
•
Binary picture processing
•
Error diffusion
•
Dithering
Video Controller
•
Video path control
The image data then goes to the LD driver (LDD).
IPU
L D D
S B U
F C I
V C U
F a x ( F C U B o a r d )
I P U - B
V i d e o
Controller
Printer/Scanner
S I M A C
H D D
Controller
PCI BUS
I P U - A
B027D507.WMF