Digital Image Processing; Outline - Canon iR2200 Service Manual

2 Digital Image Processing

2.1 Outline

The machine's digital image processing and image memory are controlled by the main
controller PCB. The following is a block diagram of digital image processing:
Reader PG
Main controller unit
Density conversion
(error diffusion method)
(text, text/photo, print photo)
COPYRIGHT © 2001 CANON INC.
Reader unit
Enlargement/reduction
(main scanning direction)
Edge emphasis
Editing
Intensity/density conversion
(LOG conversion)
Density adjustment
(F value conversion)
(LUT)
Density correction
(γ conversion)
Binary processing
1
Image memory
control
Printer PG
Binary-binary processing density conversion
Smoothing
Printer unit
F02-201-01
2000 2000 2000 2000
CHAPTER 2 MAIN CONTROLLER
Image data after
8
shading
8
8
8
8
8
8
Binary processing
(dither screen method)
(film photo)
1
Compression/de-compression,
rotation, enlargement/reduction
SDRAM
I/O control
1
1
4 or 2
CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
HDD
Image server
2-7 S