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20 September 1999
2.2 IMAGE PROCESSING
2.2.1 OVERVIEW
L D
D r u m
Driver
LDD
The CCD generates an analog video signal. The SBU (Sensor Board Unit)
converts the analog signal to an 8-bit digital signal, then it sends the digital signal
to the BICU (Base-engine and Image Control Unit) board.
The BICU board can be divided into three image processing blocks; the IPU
(Image Processing Unit), FCI (Fine Character Image), and LD controller (VCU).
• IPU: Auto shading, filtering, magnification, γ correction, and gradation processing
• LD controller: LD print timing control and laser power PWM control
• FCI (inside the LD controller): Smoothing (binary picture processing mode only)
Finally, the BICU board sends the video data to the LD drive board at the correct
time.
The EMB board is the copier feature expander option, which provides extra
memory for the copier features.
SBU
LD
Controller
(VCU)
FCI
2-5
IMAGE PROCESSING
M e m o r y
Control
IC
IPU
Scanner Controller
BICU
E M B
Fax Controller
Printer Controller
A265D500.WMF
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