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Kappa Sigma Clipping

Lehmann, Gaetan
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Submitted by Gaetan Lehmann on 2006-11-13T18:49:30Z.

When an image is mostly composed of background pixels, most of the automatic thresholding methods are failing to produce a relevant threshold. This is mainly caused because one mode is over represented compared to the other in the histogram of the image. The Kappa-Sigma clipping, a method largely used in astronomy, don't try to separate 2 modes in the histogram, but rather try to find the properties of the only usable mode, the one of the background, and compute a threshold to select the values significantly different of the background.