How to exclude NaN values from evaluation on raster data

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Karolina
Karolina 2015-8-5
编辑： Karolina 2015-8-7
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 2015-8-5
x_no_nans = x(~isnan(x))
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Sean de Wolski
Sean de Wolski 2015-8-6
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 2015-8-7
编辑：Karolina 2015-8-7
I have two datasets where the threshold is zero. EM is for these data: 0.9862, and 0.5902

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