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CHAPTER 4 IMAGE PROCESSING SYSTEM
4-12
COPYRIGHT
©
2000 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
F. Density Processing
1. Outline
The digital image processing block performs the following density processing:
[1] LOG conversion Part 2>Chapter 3>2.4.1
[2] Density correction Part 2>Chapter 3>2.4.4
[3] AE processing Part 2>Chapter 3>2.5.2
[4] Density adjustment Part 2>Chapter 3>2.4.3
[5] Density adjustment during printing
Of the foregoing functions, 1. through 4. are performed when scanner input image data is being
read, and 5. is performed when printing scanner input image data/PDL input image data.
Figure 4-304 Flow of Density Processing
Edge emphasis
LOG conversion (LOG table)
Density adjustment (F value table)
AE processing (AE table)
Binary processing
Multiple-value data
Binary data
Density adjustment (
table)
Density adjustment
when reading data
Density adjustment (laser power/developing bias)
Density adjustment
when printing data
Selects a table to suit the text, text/photo,
or photo mode setting.
Converts image signals possessing intensity
data representing reflected light into image
signals possessing data representing toner
density.
Identifies the type of original by
pre-scanning, and selects the best AE
table. (AE with priority on image quality)
Selects an F value table to suit the Copy
Density key setting on the control panel.