Compression/De-Compression; Binary Processing (Error - Canon iR2200 Service Manual

2.2.6 Binary Processing (error diffusion method T-BIC)
In the error diffusion method (T-BIC), the texture is controlled to process the data for op-
timum printing effects; 8-bit image density signals of each mode (text, text/photo, print
photo) are converted into 1-bit image density signals (binary).
2.2.7 Binary (dither screen method)
In the dither screen method, the texture is controlled to process the data for optimum
printing effects; 8-bit image density signals for film photo mode are converted into 1-bit im-
age density signals (binary).
Although expressed in binary, the resulting signals enable reproduction in 256 gradations
(dither screening of 40×40 pixels).
2.3 Image Memory Control
The image data after binary processing is controlled for the following:
2.3.1 Compression/De-Compression, Rotation, and Enlargement/Reduc-
tion
The binary data generated as the result of the foregoing processes is subjected to the fol-
lowing: compression/de-compression (for electronic sorting), rotation, resolution conver-
sion.
2.3.2 SDRAM
The image data subjected to image memory control is temporarily stored in SDRAM.
2.3.3 HDD
The HDD functioning as an image server is used to store image data for the Box function.
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 2 MAIN CONTROLLER
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