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Image Emphasis
Image Emphasis performs filtering to emphasize image edges or to smooth (IPC-2D) or
remove background noise (IPC-3D). If text edges are not clear or faint, turn on the Image
Emphasis. Three levels of Image Emphasis, High/Mid/Low, are available. As a side effect,
Image Emphasis also emphasizes the noise. It is better to set Image Emphasis higher to obtain
good image, until the noise is not perceptible.
In IPC-2D, Smooth is also available which works as negative emphasis so image edges
becomes faint even if original is ordinary sharp.
In IPC-3D, Background Removal is available instead of Smooth. Background Removal is
effective to remove background tones. For the case of the texts surrounded by halftone pattern
such as dither, background should be removed to emphasize the text. Background is useful for
such cases.
The algorithm of Smooth and Background Removal is deferent but the outputs are similar.
Option
Common
Outline Extraction OFF
No Emphasis and smoothing
High emphasis
IPC-2D
Mid emphasis
Low emphasis
Smooth (Negative effect of emphasis)
No emphasis and background removal
High emphasis
IPC-3D
Medium emphasis
Low emphasis
Removes noisy background
Table 3.17 Parameter of Image Emphasis
Parameter
3.3 Optional image function
Image
control
value
register No
B'101xxxxx'
B'xxxxx000'
B'xxxxx001'
B'xxxxx010'
B'xxxxx011'
A#2/B#2
B'xxxxx1xx'
B'xxxxx000'
B'xxxxx001'
B'xxxxx010'
B'xxxxx011'
B'xxxxx1xx'
Default
OFF
OFF
Off
3-23
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