Ipu (Image Processing Unit); Overview - Ricoh R-C4 Service Manual

21 July 2006

6.5.5 IPU (IMAGE PROCESSING UNIT)

Overview

SBU
LDD
The image data from the SBU goes to the IPU (Image Processing Unit) ICs on the
IPU 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
GAVD
• FCI (Fine Character and Image)
The image data then goes to the LD driver (LDD).
Copy Data Security Board
IPU-A
IPU-B
GAVD
Video
Controller
FCI
IPU
6-23
IMAGE PROCESSING
Fax (FCU Board)
Controller
Printer/Scanner
ASIC
HDD
B205D507.WMFF