Image Processing
D017/D018/D019/D020 6-24 SM
Color Scanner Unit
SBU
The VPU (Video Processor Unit) does the following functions:
1. Black level correction
2. White level correction
3. Gradation calibration
4. ADS control (Background Density)
5. Creating the SBU test pattern
Operation Summary
The signals from the 3-line CCD, one line for each color (R, G, B) and 2 analog signals per
line (ODD, EVEN), are sampled by the ASIC and converted to digital signals in the 10-bit
A/D converter. This is the first phase of processing the data scanned from the original.
Storing Operation Settings
The controller stores the SBU settings. These values must be restored after the lens block
is replaced:
SP4-008-001
Sub Scan Mag Sub Scan Magnification Adjustment
SP4-010-001
Leading Edge Reg Leading Edge Registration Adjustment
SP4-011-001
Side to Side Reg Side to Side Registration Adjustment
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