how to set black (pixel=0 or <20) to NaN in an image

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Tian Tian
Tian Tian 2017-8-31
评论： Tian Tian 2017-8-31
Hi there, can anyone tell me how to convert black regions on grayscale image to NaN value? I appreciate any answers.

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KSSV
KSSV 2017-8-31
Let I be your matrix....read using imread
If you want to make pixels [0 20] to NaN..do this:
I(I>=0 & I<= 20) = NaN

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