IMAGE PROCESSING
SM 6-17 B044/B045/B046
Detailed
Descriptions
6.8 IMAGE PROCESSING
6.8.1 OVERVIEW
The scanned image is processed by the following modules.
In the SBU
• CCD: Converts the reflected light from the image into an analog signal. Driven
by the CDM (CCD Drive Module) on the VPL.
• Amp: Amplifies the analog signal and sends it to the VPL on the FCU as a
digital signal.
In the VPL chip on the FCU
• VPU: Video correction (black level, shading, peak tracking and correction),
image correction (gamma correction), and reduction processing (in
main-scan direction). (☛ 6.8.2)
• IPU: Magnification processing (in main scan direction), filtering, second
gamma correction (for fax only), etc. (☛ 6.8.2) )
• LIF Smoothing, edge correction, FCI (fine character adjustment) (☛ 6.8.2)
The data then moves to the LD drive board in accordance with timing controlled
by the FCU.
Note the following:
• The VPU and IPU are submodules of a larger module, the VPM (Video
Processing Module). The VPM includes interface components (not shown)
that interface these submodules to the VRAM processing memory.
• The VPC (Video Path Control circuit) controls which signal is sent to the LIF.
• Abbreviations: SBU = Sensor Board Unit; LIF = Laser Interface; VPU =
Video Processing Unit; IPU = Image Processing Unit.
Optional
DIMM
Optional Printer Controller
FCU
SBU
FCI
LIF
LDD
VRAM
Drum
VPL
Video
Processing
C
C
D
Amp
V
P
C
VPM
VPU
IPU
CDM
B046D100.WMF
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