Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/FLE">FLE</a><hr>
<H3>PARAMETERS</H3>
FLE is controlled by the following global parameters:
<P>
<pre>Name     Prompt                                  Count     Type
FILE     Database File Name                      1-64      Char
DBIC     Database Input Channel                  1         Int
DBOC     Database Output Channel                 1         Int
FLSZ     Filter Size: Pixels, Lines              1-2       Int
NOISE    Type of Noise: ADDI/MULT/BOTH           4         Char
NOISEVAR Noise variance                          0-1       Real
NLOOK    No. of Looks                            0-1       Int
ADDMEAN  Additive noise mean                     0-1       Real
MULMEAN  Multiplicative noise mean               0-1       Real
THRVAR   Variance threshold                      0-1       Real
MASK     Area Mask (Window or Bitmap)            0-4       Int
</pre>
<H4>FILE</H4>
Specifies the name of the PCIDSK file containing the channel to be
filtered.
<P>
<PRE>
 EASI&gt;FILE=&quot;filespec&quot;
</PRE>
<H4>DBIC</H4>
Specifies the input channel to be filtered.
<P>
<PRE>
 EASI&gt;DBIC=i
</PRE>
<H4>DBOC</H4>
Specifies the output channel for the filtered data.
<P>
<PRE>
 EASI&gt;DBOC=j
 EASI&gt;DBOC=DBIC                 | DBIC is overwritten
</PRE>
Only the area under MASK is written to DBOC.
<P>
<H4>FLSZ</H4>
Specifies the filter size. The filter must be square.
<P>
<PRE>
 EASI&gt;FLSZ=pixels,lines         | odd values from 3x3 to 11x11
 EASI&gt;FLSZ=k                    | pixels = lines = k
 EASI&gt;FLSZ=                     | defaults to 3x3
</PRE>
<H4>NOISE</H4>
Specifies the kind of the noise on the input channel.
<P>
<PRE>
 EASI&gt;NOISE = &quot;ADDI&quot;            |  Additive noise
 EASI&gt;NOISE = &quot;MULT&quot;            |  Multiplicative noise
 EASI&gt;NOISE = &quot;BOTH&quot;            |  Additive &amp; multiplicative noise
</PRE>
Note: For most radar data, the noise is usually multiplicative.
<P>
<H4>NOISEVAR</H4>
Specifies the noise variance for the image channel.
<P>
<PRE>
 EASI&gt;NOISEVAR=i
</PRE>
This parameter specifies the noise variance of the image. The user
can measure this value on the image by selecting a flat area on the
image and run HIS program to calculate the standard deviation of the
area. NOISEVAR is equal to the square of the standard deviation of
the flat area. For multiplicative noise, if the user does not know
of any flat area on the image, the noise variance can be estimated
from the number of looks of the image. See the NLOOK parameter for
details. If both NOISEVAR and NLOOK are not specified, NOISEVAR is
defaulted to zero.
<P>
<H4>NLOOK</H4>
Specifies the number of looks of the image for multiplicative noise.
<P>
<PRE>
 EASI&gt;NLOOK=i
</PRE>
This parameter specifies the number of looks of the image and is
applicable only for the case of multiplicative noise. It is used to
calculate the noise variance of the image, if the parameter NOISEVAR
is not specified. If this parameter is specified and NOISEVAR
parameter is not specified, NOISEVAR will be equal to 1/NLOOK with
noise mean equals to 1. If NOISEVAR parameter is specified, this
parameter will be ignored.
<P>
<H4>ADDMEAN</H4>
Specifies the additive noise mean for the image channel.
<P>
<PRE>
 EASI&gt;ADDMEAN=i
 EASI&gt;ADDMEAN=          | defaults to 0 (uniformly distributed noise)
</PRE>
If NOISE=&quot;MULT&quot;, this parameter is ignored.
<P>
<H4>MULMEAN</H4>
Specifies the multiplicative noise mean for the image channel.
<P>
<PRE>
 EASI&gt;MULMEAN=i
 EASI&gt;MULMEAN=          | defaults to 1 (uniformly distributed noise)
</PRE>
If NOISE=&quot;ADDI&quot;, this parameter is ignored.
<P>
<H4>THRVAR</H4>
Specifies the filter window variance threshold for the image
channel.
<P>
<PRE>
 EASI&gt;THRVAR=i
 EASI&gt;THRVAR=           | variance threshold ignored
</PRE>
This parameter detects edges and activates the Improved Lee Filter.
This parameter can only be specified for a 7x7 or a 9x9 filter
window (FLSZ).
<P>
<H4>MASK</H4>
Specifies the area in the input channel which should be processed.
This can be one of the following:
<P>
<PRE>
 EASI&gt;MASK=xoff,yoff,xsize,ysize        | process windowed image
 EASI&gt;MASK=b                            | process image under bitmap
                                        | stored in segment b
 EASI&gt;MASK=                             | process entire channel
</PRE>
<hr>
Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/FLE">FLE</a><br>
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