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“Dark” filters work on the low side of the local median, while “Bright” filters work on the
high side of the local median. The filter is only applied if the pixel’s value exceeds (or is
below) a threshold expressed as a percent of the local median x 100.
For example, in the figure above, a Despeckle Dark Low threshold of “66” indicates that a
pixel that is 34% below the local median will be replaced by the local median. A Despeckle
Bright High threshold of “120” indicates that a pixel that is 20% brighter than the local
median will be replaced.
The intensity range in which each filter operates can be set by a value known as “Minimum
ADU Affected.” With the “Dark” filters, for example, pixel values that fall below the
Minimum ADU Affected will be operated on using Despeckle Dark Low, whereas pixel
values that lie above the Minimum ADU Affected will be operated on using Despeckle Dark
High settings.
Given this terminology, a simplified way to visualize the region in which each filter operates
is shown in the following figure.
Summary of Contents for KINETIX
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