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Custom 3x3 Filter
The Custom 3x3 Filter command convolves a
user-specified 3x3 kernel. This is a simplified version of the
Custom Filter Kernel. The filter kernel contains
numeric weights applied to values in the neighborhood of each
target pixel. The kernel values are actually weights applied to
pixels in a 3x3 neighborhood centered on each target pixel in the
image. The kernel weights may be normalized to a "volume" of 1.0
without typing in normalized values.
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The Custom 3x3 Filter command opens from
the Image Window > Process >
Filters menu and  button
on the Main Toolbar. The "immediate"
form, shown first, opens when an image or image set is displayed in
the top-most window. The general form can be used to select source
images from folders, windows, or by matching templates.
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Custom 3x3 Filter Properties
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Profile [|>]
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Selects the parameter profile for this command and
allows you to save or work with existing presets.
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[Select]
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Opens the
Select Source Images dialog to choose images from an
image window, folder, files, name template, or a Mira File
List.
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Filter Weights
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The weight for each element of the filter kernel.
After entering weights, you can have the filter normalized during
processing checking the Normalize
check box.
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 Normalize
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Check this box to have the filter normalized to
unit volume such that the sum of all weights equals 1.0. This is
done at processing time so the filter can be shown more simply in
the weight grid.
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Source Region
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Specifies the rectangular region to be processed.
The options are as follows:
Entire image
The entire image is processed.
Image Cursor
The region to be processed is selected using the
Image Cursor.
Rectangle
The region specified by Min and Max limits
for Column and Row coordinates is processed.
Column and Row, Min and
Max
When Rectangle is
selected, these values specify the column and row limits to be
processed.
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Tip
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Be careful not to use Normalize when the filter weights sum to 0. Many
operators such as gradient filters normalize to 0 whereas a
sharpening filter, for example, normalizes to a value of 1.
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Related Topics
Spatial Filter Commands
Custom Filter Kernel
Mira Pro x64 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc. All
Rights Reserved.
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