Re: heat map

Posted by Gabriel Landini on
URL: http://imagej.273.s1.nabble.com/heat-map-tp3690310p3690312.html

On Thursday 26 November 2009  13:46:07 Szilvia Mezey wrote:
> I've been tangled up in a problem with ImageJ and hope to find somebody who
> can help...
>
> I'm trying to turn a thresholded image into a heat map, where different
> colours indicate the density of black pixels in a given area. More labelling
> would be red, changing to green and then blue in areas with less labelling
> and white is no label at all. Is there any way of doing this in ImageJ?
> Can't find any macros or plugins (not even any kind of free software), even
> though I'm sure I'm not the first to tackle this problem.

Run a mean filter of size of your local region.
Apply some LUT such as "fire"
The colour will vary depending on the mean value of the set pixels in a region
given by the filter kernel size centred at that location.

Cheers

G.