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Custom Filter Kernel
The Custom Filter Kernel command convolves a
user-specified filter kernel. The filter kernel contains numeric
weights to be applied to values in the neighborhood of each target
pixel. The filter kernel is defined by its width, height, and
kernel values entered into a grid. The kernel values are actually
weights applied to pixels in the neighborhood of each target pixel
of the image. The kernel may be any size you specify and a given
kernel may also be normalized to a "volume" of 1.0 without typing
in normalized weights.
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The Custom Filter Kernel 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 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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Custom Filter Kernel
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This group specified the properties of the kernel.
Enter the filter width, height, and weights.
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Width
Sets the number of columns in the filter grid.
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Height
Sets the number of rows in the filter grid.
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(Weights)
Specify the weight for each element of the filter
kernel. After entering weights, you can normalize the filter to
unit weight by clicking the [Normalize] button.
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[Normalize]
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Click this button to normalize the filter weights
so the sum of weights is 1.0.
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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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Normalizing the Kernel
The [Normalize]
button changes the kernel values in the weight grid. When you click
this button, all kernel values are summed to produce a
normalization constant which is then divided into all kernel
entries. The result is a kernel for which all weights sum to 1.0.
Use normalization when the filter should preserve the signal level.
A filter like the embossing filter example show here does not use
normalization. In fact, the sum of kernel weights for this filter
is 0.0.
Related Topics
Filtering Images
Custom 3x3 Filter
Mira Pro x64 8.83 User's Guide, Copyright Ⓒ 2026 Mirametrics, Inc.
All Rights Reserved.
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