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CF5001 Ver.1.0 Sep. 2003 SCANNER
2-9
II UNIT EXPLANATION
1.2.6 AE control
The CCD sensor installed on the A/D converter board (ADB) reads the copy density during the AE scan, it
performs the process responsive to the read density on the overall control board (OACB), and then it
selects the most favorable γ correction curve. The CPU on the image processing board (IPB) performs the
selection.
A. AE/ACS sampling range
The AE/ACS sampling range is identical to the read range in both the platen mode and the DF mode.
1.2.7 Image processing
A. AOC (automatic offset control)
With the circuit in the CCD sensor, AOC automatically adjusts the analog offset voltage from the sensor to
be the lower limit of the A/D converter.
B. AGC (automatic gain control)
GC automatically controls the level of the analog amplification of the CCD sensor output at the shading
white correction to be the higher limit for the A/D converter.
C. Shading correction
(1) Types of the shading correction
• White correction
• Black correction
(2) Execution timing
• At the main switch (SW2) ON
• At the start of scan job
[1] 10 mm [2] AE/ACS sampling range
8050ma2054
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[2]
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