Minimum filter

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Minimum filter

cannaroz
Hello!
When I open the minimum filter of imageJ, in the dialogue box it has 2.0
pixels radius. I was wondering if it is possible to use a different value
such as 1 or even 0.5, or if it is wrong to use such smaller values and why.
Many thanks.
CC



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Re: Minimum filter

Michael Schmid-3
Hi CC,

for the Mean, Minimum, Maximum, Median, Variance and
Process>Noise>Remove Outliers filters you can see examples of the filter
size (pixel neighborhood taken into account) with Process>Filters>Show
Circular Masks.

See

https://imagej.nih.gov/ij/docs/guide/146-29.html#toc-Subsubsection-29.11.10

The smallest radius is 0.5 (using the pixel and its 4 immediate
neighbors). A radius of 1 gives you a 3x3 filter. For most operations,
the largest radius is 1000 (not shown in 'Show Circular Masks' any
more). For the Median and Remove Outliers, the maximum radius is only
100 because median filtering is much slower.

If you want a square or rectangular area instead of a circular one, use
the 'Fast Filters' plugin.

Michael
________________________________________________________________
On 05/09/2017 15:43, cannaroz wrote:
 > Hello!
 > When I open the minimum filter of imageJ, in the dialogue box it has 2.0
 > pixels radius. I was wondering if it is possible to use a different value
 > such as 1 or even 0.5, or if it is wrong to use such smaller values
and why.
 > Many thanks.
 > CC

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Re: Minimum filter

cannaroz
Thank you very much Michael! Your answer was very helpful!
CC



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