Image Processing System; Outline Of The Image Processing System; Processing System - Canon iR105 Service Manual

3 Image Processing System

3.1 Outline of the Image Processing System

The image processing system has the following major functions:
• CCD (image sensor)
number of lines: 1; number of pixels: 7500; pixel size: 7 × 7 µm
• Shading Correction
shading adjustment: executed in service mode
shading correction: executed for each copy
• Auto Density Adjustment (AE)
executed for each single line in main scanning direction
The following is the functional construction of the image processing system:
Analog image processing block
CCD
Analog
image
conversion
processing
CCD/AP PCB
Each PCB of the image processing system has the following functions:
[1] CCD/AP PCB
CCD drive, analog image processing, A/D conversion
[2] Reader Controller PCB
shading correction, auto density adjustment (AE), image data conversion (4 channels
→ 2 channels)
COPYRIGHT© 2001 CANON INC.
Digital image processing block
Reader controller PCB
A/D
F02-301-01
2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001
CHAPTER 2 NEW FUNCTIONS
Shading processing
Auto density correction (AE)
Pixel data
(4 channels → 2 channels)
Main
controller
2-37