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COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 3 IMAGE PROCESSING SYSTEM
3-2 R
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.
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.
F03-202-01 CCD Block Diagram
Shift register
Light receiving
segment
(photodiode)
Shift register
Output buffer
Output buffer
Gate
Gate
123456
Odd-number pixel data
Even-number pixel data
CCD
8
J403
12V
5V
J407
J408
· Gain correction
· Offset correction
· Parallel/serial
conversion
A/D
conver
-sion
Analog image signal
Digital
image
signal
Analog
image
signal
CCD PCB
CCD
driver
Reader controller PCB
Even-number
pixels
Odd-number
pixels
CCD drive
signal
Digital
image
processing
block