peak_local_max() Question.

[Claiborne Morton]

Hey guys,

     I am currently using this function for water-shedding in a project of 
mine. I am a bit curious as to what the parameter, threshold_abs is 
actually doing. The website 
here: http://scikit-image.org/docs/dev/api/skimage.feature.html#skimage.feature.peak_local_max 
says "Minimum intensity of peaks", but I am not sure how this applies to a 
binary image where intensity of a pixel is either 1 or zero. When set the 
parameter equal to an integer, say 12, it removes the smaller particles 
from the image, which is nice because that is something I need to do, but I 
am just not sure why it does this. Below is a comparison of the results 
with and with out the parameter. Could someone please explain what is 
happening?

Images are attached for:
      With threshold_abs = 12
      Without threshold_abs (I assume default is threshold_abs = zero?)
  
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