2. Image Processing Parameters Adjustment
The tables in the following pages show the following video processing pa-
rameter settings for each of scanning mode.
One byte of parameter is assigned for each mode, and they all have the
same definitions as follows.
Bit No.
FUNCTION
COMMENTS
0
Edge detection during the
halftone process
0: Off 1: On
This bit can be used in halftone mode only.
0: The image becomes lighter, and thin lines
become paler.
1: Suitable for most photo originals.
1
Auto image density during the
normal image process
0: Off 1: On
Do not change the setting.
2
Edge detection threshold
during the halftone process
0: Normal 1: High
0: The image becomes lighter (suitable for
enlarged copies).
1: The image becomes darker (suitable for
full-size copies).
3
Background detection
threshold during the normal
image process
0: High 1: Low
0: Suitable for originals that have dark
background (e.g. newspaper)
1: Suitable for most originals.
4
Edge enhancement during
the halftone process
0: Off 1: On
0: Suitable for photo originals (default setting).
1: Suitable for originals with photo and text.
The edges of text become much sharper, but
moire might appear in photo areas.
5
MTF algorithm
0: Low 1: High
The “High” setting enhances the thickness of
thin lines and dots more than the “Low” setting.
Only one of these bits is used for each
scanning mode; see the notes at the end of the
parameter setting table for details.
6
MTF algorithm
0: Low 1: High
7
MTF
0: Off 1: On
In ADF mode, the MTF process is disabled.
0: In halftone mode, the image becomes
lighter. In normal mode, thin lines may not be
reprouced clearly.
1: The thickness of thin lines and dots are
enhanced, but small letters might become filled
in.
May 22nd, 1995
REPLACEMENT AND ADJUSTMENT
IMAGE ADJUSTMENT
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