Digital Image Processing; Outline - Canon iR8500 Service Manual

CHAPTER 3 MAIN CONTROLLER

2 Digital image Processing

2.1 Outline

The image memory and the digital image processing mechanisms are controlled by the
main controller PCB; the following is a block diagram of the digital image processing
mechanisms:
Main controller PCB
Density correction
(LUT)
Binary processing
(error diffusion method; text,
text/photo, print photo)
Printer PG
3-8
Reader unit
8
Reader PG
Enlargement/Reduction
(main scanning direction)
8
Edge emphasis
8
Editing
8
Brightness/Density
conversion (LOG conversion)
8
Density adjustment
(F-value conversion)
8
Density correction
(γ conversion)
8
Binary processing
(dither screen method; film print)
1
Image memory
control
1
Binary-binary density
conversion
1
Smoothing
4 or 2
Thickening
4 or 2
Printer unit
F03-201-01 Block Diagram
COPYRIGHT© 2001 CANON INC.
1
Compression/expansion,
rotation,
enlargement/reduction
SDRAM
I/O control
2000 2000 2000 2000
Image data
after shading
HDD
Image server
CANON iR8500/7200 REV.1 AUG. 2001