Canon IR2200 Analog Image Processing, Driving the CCD, F03-201-01, F03-202-01 CCD Block Diagram

CHAPTER 3 IMAGE PROCESSING SYSTEM

2 Analog Image Processing

2.1 Outline

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.

CCD PCB	12V
	5V
CCD
driver
CCD
Odd-number Even-number
pixels	pixels
Analog image signal

J403

J407

CCD drive signal

J408

Reader controller PCB
	Analog		Digital
· Gain correction	image		image	Digital
	signal		signal
· Offset correction		A/D		image
· Parallel/serial		conver		processing
		-sion	8
conversion				block
F03-201-01

2.2 Driving the CCD

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 segment (photodiode)

Shift register

Output buffer

Odd-number pixel data Gate

6 5 4 3 2 1

Gate

Even-number pixel data

Output buffer

F03-202-01 CCD Block Diagram

3-2 R COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001