IMAGE PROCESSING
SM 6-13 B121 Series/B259 Series
Detailed
Descriptions
6.5 IMAGE PROCESSING
6.5.1 OVERVIEW
The CCD generates an analog video signal. The SBU (Sensor Board Unit)
converts the analog signal to a 8-bit digital signal, then it sends the digital signal to
the BICU board.
The BICU board can be divided into three image-processing blocks: the IPU
(Image Processing Unit), FCI (Fine Character Image), and VCU (Video Control
Unit).
• IPU: Auto shading, filtering, magnification, scanner γ correction, ID γ correction
• VCU: Printer γ correction, LD print timing control and laser power PWM control
• FCI (inside the VCU): Smoothing
NOTE: The IPU and VCU are contained in the same IC called SCRATCH on the
BICU
Finally, the BICU board sends the video data to the LD drive board at the proper
time. The DRAM on the BICU provides memory for the copier features. In addition,
optional DRAM is added to the GW controller board when the printer/scanner
option is installed.
Drum
LDD
LD
Driver
LSD
Optional
DRAM
Memory
Control
IC
Fax Controller
Printer/Scanner
Controller
DRAM
BICU
SBU
CCD
FCI
VCU
IPU
GW
Controller
B121D908.WMF
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