Image Processing; Overview - Canon iR C2880 Series Service Manual

Chapter 5
Service Mode:
COPIER>OPTION>BODY>DST-POS (level 1)
- use it to set an original reading position when the ADF is in use.
COPIER>OPTION>BODY>DFDST-L1 (level 1)
- use it to adjust the dust reading detection level for between sheets.
COPIER>OPTION>BODY>DFDST-L2 (level 1)
- use it to adjust the dust reading detection level for the end of a job.

5.3.7 Image Processing

5.3.7.1 Overview

iR C3380i / iR C3380 / iR C2880i / iR C2880 / iR C3580 / iR C3580i / iR C3080 / iR C3080i
The image processing system has the following major specifications and functions:
- CCD
- Shading Correction
Contact image
sensor (CIS)
The PCB used by the image processing system has the following functions:
- Reader Controller PCB
The machine processes images using its reader controller PCB line by line, and the processing consists in the following;
(1) Analog Image Processing
(a) drives the CCD
(b) performs gain correction and offset correction for the CCD output
5-16
0.5mm 0.5mm
D A B C
Stream
reading
glass
Scanning lamp
Number of lines: 3 (RGB, 1 line each)
Number of pixels: 7488
Size of pixel: 42.3 um
Shading correction; executed for each job
Shading adjustment: executed in service mode
Reader controller PCB
Analog image processing block
CCD
Analog image
processing conversion
drives the CCD, performs analog image processing, performs A/D conversion, performs shading
correction
Platen roller
Lens
Contact image sensor (CIS)
F-5-28
Digital image processing block
Shading processing
A/D
F-5-29
Controller block
0013-8593