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Chapter 10 Post-Acquisition Processing Mask Operations 165
Filter Matrix tab page
The Custom-Filter Filter-Matrix tab page allows you to set the filter matrix parameter
values. The filter is applied to the data-set specified via the Custom Filter Input tab page
(page 286). The processed data is saved in the file specified by the Custom Filter Output
tab page (page 307).
Filtering is accomplished by mask operations defined by parameters entered in the
matrix. These functions can enhance edges, sharpen or smooth features, or erode or
dilate an image. How these images are processed is briefly described below.
A mask is an n n matrix (n is 5, 7, 9 or 11) that is placed over every n n subsection of
the image. Each parameter in the mask is multiplied by the corresponding value of the
image. The results are summed and placed in the central position in the output file. Users
can specify the Filter Size (5×5, 7×7, 9×9 or 11×11). The Filter Sum is displayed in the
adjacent box. The
Load Defaults
button sets the matrix parameters to their factory-
default values.
Output tab page
The Output tab page allows you to name the output file. It additionally allows you to
select whether the modified data is to be displayed and to select the data type. The frame
and X-Y range are reported information only.
Figure 147.
Filter Matrix
tab page.