Digital Image Processing - Canon iR105 Service Manual

CHAPTER 2 NEW FUNCTIONS

3.6 Digital Image Processing

Digital image processing is performed by the reader controller PCB, and it mainly con-
sists of the following:
• shading correction
• auto density correction (AE)
• conversion of 4-channel pixel data to 2-channel pixel data
J1502
Gain/offset
correction data
CCD/AP
PCB
[1] 1st-half even-numbered pixel digital image signal
[2] 1st-half odd-numbered pixel digital image signal
[3] 2nd-half even-numbered pixel digital image signal
[4] 2nd-half odd-numbered pixel digital image signal
[5] even-numbered pixel digital image signal
[6] odd-numbered pixel digital image signal
2-42
Reader controller PCB
J1107
[1]
IC
Shading correction
10bit
[2]
Auto density correction (AE)
10
Pixel data
[3]
conversion from
10
[4]
4-channel-to-2-channel
10
Dust detection (IC)
COPYRIGHT© 2001 CANON INC.
CPU
Target value
F02-306-01
2000 2000 2000 2000
EEP-ROM
SRAM
[5]
8bit
[6]
8
J1901
J1103
CANON iR105 REV.0 JULY 2001
Main
controller
PCB
Original
orientation
detection
PCB