Re: median filter that preserves peaks

Posted by Neil Fazel on Sep 06, 2013; 9:18pm
URL: http://imagej.273.s1.nabble.com/median-filter-that-preserves-peaks-tp5004693p5004707.html

Thanks. I will look into that.

I have attached a montage of 3 profile plots using 1) the original image, 2) image after applying median filter with radius 0.5, and 3) image after median filter with radius 1. You can see how the Y axis maximum of the plots goes from 3.28 to 3.15 to 3.13; the high frequency component has been reduced (good) at the same time that the peaks have been flattened (bad).

I guess what I'm looking for is a filter that replaces local outliers (i.e. outliers in a neighborhood 2-3 pixels in each direction) with the median, but preserves them if they remain outliers in a larger neighborhood, which indicates that they are not noise but actual peak signal.

Neil


--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html