Image Processing; Outline - Canon iR1600 Service Manual

CHAPTER 3 IMAGE READING/PROCESSING SYSTEM

4 Image Processing

4.1 Outline

The machine performs image processing and correction in copier mode as shown in the
following block diagram.
The image data (analog signals) read by the contact sensor is converted into digital signals
by the analog processor PCB. The resulting image data is subjected to processing/correction
by the analog processor PCB and image processor PCB.
Contact
sensor
A/D conversion
LED intensity processing
Compression/expansion/rotation
3-8
Analog image data
(OS1 to 4)
Shading correction
Analog processor PCB
Binary error diffusion
edge emphasis/editing
density adjustment
(F-value conversion)
Density conversion (LUT)
Image processor PCB
To printer control block
F03-401-01
COPYRIGHT© 2002 CANON INC.
Re-ordering
ABC processing
8-bit digital image data
Enlargement/reduction
Smoothing
Density correction
(γ conversion)
Image memory (SDRAM)
2000 CANON iR1600/iR2000 REV.1 JAN. 2002