KAM-XM-SERIES Instruction Manual
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Configuration and Adjustments
Controls for this filter type include the following:
•
Enable – the filter must be enabled.
•
Boost – sets the amount of amplitude prior to the cutoff frequency. This
boosting of the amplitudes gives the appearance of sharpening in the
image to help compensate for blurring that occurs when filtering out
high frequency information.
•
Cutoff – sets the cutoff frequency so that information greater than this
value will be filtered. Information less than the cutoff value will be left
alone.
•
Direction Control – allows setting the filter to affect both the horizontal
and vertical axes or just the horizontal or vertical axis.
Temporal Recursive Filtering
This noise reducer is a motion adaptive temporal recursive filter that works
well in removing random and Gaussian noise. Each pixel in the filter
process is labeled as motion, no motion, or noise.
Each of these classes of pixels is treated differently in the noise reduction
process as follows:
•
For pixels in which there is no motion, low Gaussian noise may be
reduced via temporal processing by a weighted averaging over succes-
sive frames.
•
For pixels labeled as random noise, spatial processing replaces these
pixels.
•
Pixels labeled as being in motion are left as is to avoid artifacts that may
be introduced through temporal processing.
Controls for temporal filtering include the following:
•
Enable – the filter must be enabled.
•
Red Overlay – when turned on, the filter superimposes a red overlay
onto areas in the input image where the temporal recursive filter iden-
tifies motion. This red overlay will display what area is not being fil-
tered.
•
Auto – when Auto mode is turned on, a feedback controller is engaged
that dynamically sets the distance, no motion, and motion slider con-
trols based on noise and motion measurements. The pixels determined
to be in motion will be shown in red as shown in
These pixels will not have any noise reduction applied to them.
The Bias control in Auto mode adjusts the noise set point in the tem-
poral recursive controller. The higher the bias, the more aggressive the
controller is towards the noise in the scene. The lower the bias setting,
the more sensitive the controller is towards motion in the scene.
