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IMAGE PROCESSING
6.6.2 SBU BLOCK DIAGRAM
O
R(B)
E
O
G
CCD
E
O
B(R)
E
SBU
Signal Processing
1. Signal Amplification
• Odd-pixel and even-pixel RGB analog signals from the CCD are amplified.
2. Signal Composition
• The amplified signals are combined after A/D conversion.
A/D Conversion
• The analog signals (CCD output) are converted to 10-bit (1,024 gradations)
digital signals.
White Level Correction
• A white reference plate is scanned before the original is scanned.
• Data is updated before the original is scanned.
• The differences in the white level across the page, including irregularities in the
CCD and the optical parts across the main scan, are corrected.
Others
The SBU controller exchanges the R and B signals if originals are scanned through
the ARDF.
10 bit
Analog Amplifier
A/D Converter
10 bit
Analog Amplifier
A/D Converter
10 bit
Analog Amplifier
A/D Converter
R
10 bit
Memory
G
10 bit
SBU
Controller
Memory
B
10 bit
BICU
6-24
10 February 2005
Field
Field
ASIC
B156D013.WMF
8 bit
8 bit
8 bit
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