CHAPTER 2 MAIN CONTROLLER

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

Reader unit

Image data after

 

 

 

 

 

8

 

 

 

 

shading

 

Main controller unit

 

 

 

 

Enlargement/reduction

 

 

(main scanning direction)

 

 

 

8

 

 

 

 

Edge emphasis

 

 

 

8

 

 

 

 

Editing

 

 

 

 

8

 

 

 

Intensity/density conversion

 

 

(LOG conversion)

 

 

 

8

 

 

 

Density conversion

Density adjustment

 

 

(LUT)

(F value conversion)

 

 

8

 

 

 

 

 

 

 

 

Density correction

 

 

 

(γ conversion)

 

 

 

8

 

 

 

Binary processing

Binary processing

 

(error diffusion method)

(dither screen method)

 

(text, text/photo, print photo)

(film photo)

 

 

1

1

 

 

 

 

 

Compression/de-compression,

 

 

 

 

rotation, enlargement/reduction

 

 

Image memory

SDRAM

 

 

control

 

 

 

 

I/O control

 

 

 

 

HDD

Printer PG

1

 

 

Image server

Binary-binary processing density conversion

 

 

1

 

 

 

 

Smoothing

 

 

 

4 or 2

 

 

 

Printer unit

 

 

F02-201-01

COPYRIGHT © 2001 CANON INC.

CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001

2-7 S

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Canon IR2200, IR3300, IR2800 manual Digital Image Processing, Outline, F02-201-01