LSM 710 and LSM 780
LEFT TOOL AREA AND HARDWARE CONTROL TOOLS
Systems
Processing Tab
Carl Zeiss
02/2010 M60-1-0025
e
111
5.3.5
Filter
The filter function permits the processing of
scanned images with a
Median
,
Smooth
,
Sharpen
or
Bandpass
filter.
•
To open the
Filter
tool, select it from the list in
the
Processing
main tab (Fig. 111).
•
Select the
Input Image
with the
button and choose the filter of your choice from
the
Type
pull down (Median, Smooth, Sharpen,
Band).
•
Select the channels you want to process with
the
buttons. In the filter
panel, the filter-specific parameters can be set
as described in the following sections.
Median Filter
With the median filter, the gray value of each
center pixel is replaced with the median value of
the neighboring pixels. The viewed neighbor pixels
are defined by a square of a certain size called the
kernel. The modified pixel now is the center pixel
of this pixel matrix.
The median value is defined as the middle value
(not average) of all the gray values sorted in
ascending order within a matrix.
Image noise will be reduced by the application of
the median filter. The cut-off of regions will slightly
blur. Local maxima will be flattened. The dynamic
range will be reduced considerably.
The effect of the filter increases with the matrix
size. This matrix / kernel size can be set for each
dimension with the three sliders in the filter panel
or by setting the size in the spin-box on the right
hand side of each slider (see Fig. 112). A larger
kernel, however, also increases the processing
time. Other settings of this filter can not be
modified.
Fig. 111
Filter window
Fig. 112
Median filter settings
