IMAGE PROCESSING
2-20
A229 SM
2.3 IMAGE PROCESSING
2.3.1 OVERVIEW
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 SBICU (Scanner, Base-engine, and Image Processing Control Unit) board.
The SBICU board can be divided into two image processing blocks; the IPU (Image
Processing Unit) and the memory control IC. These two ICs mainly do the
following:
•
IPU:
Auto shading, filtering, magnification,
γ
correction, gradation
processing, and video path control
•
Memory Controller:
Image compression, image rotation, interface with
HDD controller, image repeat, and combine originals
Finally, the SBICU board sends the video data to the LD drive board.
LD
Driver
IPU
Drum
SBICU
LDDR
SBU
CCD
HDD
GA1
LD
Controller
(GAVD)
LD
Driver
GA2
Memory
Control ICs
A229D578.WMF
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