How to exclude NaN values from evaluation on raster data

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I have a raster which have NaN values. I would like to evaluate graythresh for my data, but the NaN values are taken into account and as a results I have 0 (zero). Is there a way to exclude NaN values from evaluation or remove them from data?

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Sean de Wolski
Sean de Wolski il 5 Ago 2015
x_no_nans = x(~isnan(x))
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Sean de Wolski
Sean de Wolski il 6 Ago 2015
What is EM, the effectiveness metric output? Otsu is not great for all images, it's really only for when there is an object in the foreground.
Karolina
Karolina il 7 Ago 2015
Modificato: Karolina il 7 Ago 2015
I have two datasets where the threshold is zero. EM is for these data: 0.9862, and 0.5902

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