UVP Life Science - Manual (Page 63)

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49
Remove Noise
This filter removes periodic (patterned) noise from an image. Patterned noise is removed by creating a
frequency-space mapping (Fourier transform) of an image and removing frequency spikes away from the
graph's origin.
There are two issues to be aware of with noise removal. First, if the image has actual (desired) pattern
information, the operation will not be able discern these from actual noise and it will remove them.
Second, the mathematics of the operation can cause some edges to be identified as patterns, resulting in
blurring on some images.
Remove noise is also referred to as Starfield Subtraction. The Image History indicates the noise removal
as Starfield Subtraction.
• Click onto Remove noise from the Edit menu button.
• Removing noise in a large image may take ten or fifteen seconds.