COPYRIGHT © 1999 CANON INC.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-15
CHAPTER 4 IMAGE PROCESSING SYSTEM
G.
Binary Processing
The copier performs binary processing for the following:
[1] Print photo mode (dither screen method)
[2] Text, text/photo mode, print photo mode (R-ED, i.e., random error diffusion, method)
1.
Dither Screen Method
Image data is subjected to screen processing so that the images may be produced in 256 grada-
tions out of binary data.
Figure 4-305A Conceptual Diagram of the Dither Screen Method
4 pixels
8 pixels
In this area, as many as 16
different density patterns
may be created. As such, an
area consisting of 8 × 4
pixels enables creating of
256 (16 × 16) density
patterns.
The black pixels are
thickened according to
density.
Screens consisting of 106
lines running at 45˚ are
created.
Summary of Contents for GP605
Page 3: ......
Page 4: ......
Page 24: ......
Page 56: ......
Page 78: ......
Page 116: ......
Page 124: ......
Page 148: ......
Page 150: ......
Page 168: ......
Page 170: ......
Page 250: ......
Page 252: ......
Page 342: ......
Page 390: ......
Page 392: ......
Page 464: ......
Page 466: ......
Page 512: ......
Page 514: ......
Page 572: ......
Page 574: ......
Page 590: ......
Page 592: ......
Page 854: ......
Page 870: ......
Page 874: ......