Image Processing - Ricoh B230 Service Manual

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6.4 IMAGE PROCESSING

6.4.1 OVERVIEW

6.4.2 SBU (SENSOR BOARD UNIT)

The VPU (Video Processor Unit) does the following functions:

Black level correction

White level correction

Gradation calibration

ADS control (Background Density)

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:

B230/B237/D042

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