CHAPTER 2 NEW FUNCTIONS
2-73
COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
4 Outline of the Image Processing System (iR8500)
4.1 Outline
The image processing system has the following major functions:
• CCD (image sensor)
Number of lines: 1 line
Number of pixels: 7500 pixels
Image size: 7 × 7 µm
• Shading Correction
Shading adjustment: in service mode
Shading correction: executed for each copy
• Auto Density Correction Executed once for every line in main scanning direc-
tion
F02-202-01 shows the functional construction related to the image processing system:
F02-401-01
The functions of each PCB of the image processing system are as follows:
[1] CCD/AP PCB: drives the CCD, processes analog images, executes A/D
conversion
[2] Reader controller PCB: executes shading correction, executes auto density cor-
rection, converts image data (4 channels → 2 channels)
CCD/AP PCB
Reader controller PCB
CCD
A/D
conversion
Shading processing
Auto density correction (AE)
Image data
(4 channels → 2 channels)
Analog
image
processing
Analog image processing block
Main
controller
block
Digital image processing block
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