Hi Tischi,
you could have a look at the ij.plugin.filters.RankFilters class of the old ImageJ 1.37 version (you might add the 'CONVERT_TO_FLOAT' flag not present in ImageJ 1.37, then you can safely assume that the run(ip) method of your plugin filter is always called with Float values and you need not convert it).
In Version 1.38, ImageJ started to use a code for minimum/maximum that needs to have a contiguous range of pixels in each line (that new code is much faster, but not suitable for your needs).
You could also have a look at some other plugins, e.g.
http://imagejdocu.tudor.lu/doku.php?id=plugin:filter:thresholded_blur:start http://rsb.info.nih.gov/ij/plugins/sigma-filter.htmlto see how to write a filter with preview.
Michael
________________________________________________________________
On Jun 20, 2012, at 23:27, Christian Tischer wrote:
> Hello,
>
> i'd like to replace the value of each pixel with the maximum value that is
> found in a certain neighborhood, but in contrast to the normal
> grayscale-dilation which (i guess) uses a circular kernel for this, i'd
> like to use more free-style kernels, like for instance a ring shaped
> kernel, e.g.
>
> 000000000
> 000111000
> 001000100
> 001000100
> 001000100
> 000111000
> 000000000
>
> my question is what you think is the easiest way to implement this?
> or, i guess in other words, which java-code could i start from to get to
> this?
>
> thanks a lot!
> Tischi
>
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