CHAPTER 4 IMAGE PROCESSING SYSTEM
4-12
COPYRIGHT © 1999 CANON INC.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
F.
Density Processing
1.
Outline
The digital image processing block performs the following density processing:
[1] LOG conversion
Volume 3>Chapter 4>IV.G.1. "Logarithmic Correction"
[2] Density correction
Volume 3>Chapter 4>IV.G.2. "Density Processing"
[3] AE processing
Volume 3>Chapter 4>IV.G.2. "Density Processing"
[4] Density adjustment
Volume 3>Chapter 4>IV.G.2. "Density Processing"
[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.
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