Digital Image Processing; Outline - Canon iR105 Service Manual

CHAPTER 3 MAIN CONTROLLER

2 Digital Image Processing

2.1 Outline

The digital processing and controlling of image memory of the machine are performed by
the main controller PCB. The following is a block diagram showing its digital image pro-
cessing:
Main controller block
Density conversion
(LUT)
Binary processing
(error diffusing method; text,
text/photo, print/print photo)
Printer PG
3-8
Reader unit
8
Reader PG
Enlargement/reduction
(main scanning direction)
8
Edge emphasis
8
Edit processing
8
Intensity/density conversion
(LOG conversion)
8
Density adjustment
(F-value conversion)
8
Density correction
(γ conversion)
8
Binary processing
(dither screen; film photo)
1 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.
Compression/expansion,
rotation,
enlargement/reduction
SDRAM
I/O control
2000 2000 2000 2000
Image data
after shading
HDD
CANON iR105 REV.0 JULY 2001