Image Processing; Overview <Ir7105/7095 - Canon imageRUNNER 7095 Service Manual

Chapter 5

5.3.6 Image Processing

5.3.6.1 Overview <iR7105/7095>
The PCBs used in the image processing system have the following functions:
CDD/AP PCB: CCD drive, analog image processing, A/D conversion
Reader controller PCB: shading correction, image data conversion (4 channels -> 2 channels)
Analog image processing block
Analog
image
processing
1. Analog Image processing
- CCD drive
- CCD output gain correction, offset correction
- CCD output A/D conversion
CCD
[4] [3]
CCD/AP PCB
[1] 1st half even-numbered pixel analog image signal [4] 2nd half odd-numbered pixel analog
[2] 1st half odd-numbered pixel analog image signal [5] 1st half digital image signal
[3] 2nd half even-numbered pixel analog image signal [6] 2nd half digital image signal
5-20
CCD
A/D
conversion
CCD/AP PCB
[2] [1]
Analog
CCD drive
image
control
signal
Analog image
[1]
process
- gain correction
[2]
- offset correction
Analog image
[3]
process
- gain correction
[4]
- offset correction
distal image processing block
Reader controller PCB
shading processing
image data conversion
(4-system -> 2-system)
F-5-43
J102
CCD control
signal
Gain correction
data
J101
A/D
[5]
conversion
[6]
A/D
conversion
A12V
A5V
F-5-44
image signal
Controller block
J208
Gain correction
data
J204
20bit
20bit
0011-2241