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IMAGE PROCESSING
2.4 IMAGE PROCESSING
2.4.1 OVERVIEW
VRS
Board
The CCD generates two analog video signals. The SBU (Sensor Board Unit)
converts these analog signals to 8-bit digital signals, then it sends these digital
signals to the SCU (Scanner Control Unit) board through the IOB board. The IPU
(Image Processing Unit) IC on the SCU does the image processing, then the image
data goes to the computer through the Memory Control IC and the SCSI controller.
The CIS (Contact Image Sensor) unit in the duplex for reverse-side scanning
outputs two digital signals. The IPU on the ERCU (Reverse Control Unit) board
does the image processing, then the image data goes to the VRS Board through
the SCU.
S C U
Memory
D R A M
Control
IC
S C S I
Control
IC
SBU
IOB
IPU
2-16
16 February 2000
C C D
CIS
E R C U
IPU
Memory
Control
D R A M
IC
G413D508.WMF
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