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Edge emphasis and smoothing are carried out.
• Edge Emphasis (Text Image)
The outlines of characters and fine lines are made
sharper as they appear on the copy by correcting the
MTF (modulation transfer function) characteristics
(resolution).
*MTF: Modulation Transfer Function
• Smoothing (Photo Image)
Image noise contained in the solid area of the image
is reduced to smooth the image, thereby improving
image quality of photos.
MTF correction
Resolution conversion
Magnification Change
in main scanning
direction
Nonlinear conversion
Converts the output resolution
(from 400 dpi to 800, 600, 300 or 200 dpi).
Enlargement or reduction in the main scanning
direction.
Enhances reproduction of characters and fine lines
that are low in contrast.
PWB-BB
A
B
Linear γ conversion
Contrast fine-adjustment
(γ : Density reproduction curve)
Centering in main
scanning direction
Centers the image data by shifting it in the main
scanning direction.
Conversion into binary
Converts 8-bit image data into
binary image data by
comparing
to a certain threshold.
C
Binary Image
Grayscale Image