20 February, 2001 IMAGE PROCESSING
6-13
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 6-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 on the BiCU
Finally, the BiCU board sends the video data to the LD drive board at the proper
time. The IMB provides memory for the copier features (the B039 model outside N.
America does not have the IMB as standard equipment). In addition, optional
DRAM can be added to the IMB (☛ 6.5.5).
Drum
LDD
LD
Driver
LSD
Optional
DRAM
Memory
Control
IC
Fax Controller
Printer Controller
DRAM
BiCU
SBU
CCD
FCI
VCU
IPU
IMB
B039D002.WMF
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