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IMAGE PROCESSING
2.3 IMAGE PROCESSING
2.3.1 OVERVIEW
D r u m
L D D R
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.
L D
Driver
LD
Controller
(GAVD)
L D
Driver
S B U
I P U
SBICU
2-20
June 30, 1998
Memory
Control ICs
G A 1
H D D
G A 2
A229D578.WMF
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