Analog Image Processing; Outline; Driving The Ccd - Canon iR2200 Service Manual

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CHAPTER 3 IMAGE PROCESSING SYSTEM

2 Analog Image Processing

Analog image processing is performed by the CCD PCB and the reader controller PCB,

which has the following major functions:

[1] Drives the CCD.

[2] Corrects the gain in the CCD output, corrects offset.

[3] Performs parallel/serial conversion of CCD output.

[4] Performs A/D conversion of CCD output.

Analog image signal

The machine's CCD sensor is a single-line linear image sensor, and is composed of 7450

pixel photo cells.

The signals subjected to phtoconversion in the light-receiving segment are sent out in two

types of analog signals: even-number (EVEN) pixels and odd-number (ODD) pixels.

Shift register

Light receiving

(photodiode)

Shift register

Reader controller PCB

· Gain correction

· Offset correction

· Parallel/serial

F03-202-01 CCD Block Diagram

2000 2000 2000 2000

Output buffer

Odd-number pixel data

Even-number pixel data

Output buffer

CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001

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Ir2800 Ir3300