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Will imtranslate 'Fill Values' to NaN rather than an actual color ?

3 vues (au cours des 30 derniers jours)
raheem mian
raheem mian le 24 Sep 2019
Commenté : Athul Prakash le 27 Sep 2019
I want to fill values as NaN to the resulting image matrix rather than the default 0. Is this possible ?
  4 commentaires
rough93
rough93 le 25 Sep 2019
In this case if you know what values you'll have in the output, I'd suggest finding a value you know won't occur. For example, if you know you'll have 0s, 1s, and 2s, give the pixels you wanted to be NaN a value of 3.
Athul Prakash
Athul Prakash le 27 Sep 2019
if you must use NaN, then maybe you could write a script to do that manually:
i(a:b, c:d, :) = nan %set all values to nan in the region bounded by coordinates a,b,c,d
Please be aware that if the data type for the array is integral (which is most common), the array won't accept nan values. In this case, the portion of the array you set to NaN will get filled with 0's. [a variable of integral type cannot store a NaN value]
In my opinion, the way to do this is to record the portion you wish to NaN-fill. Save them as co-ordinates of a box.
Fill them with 0's, not NaN.
Then use the saved co-ordinates in your later analysis to treat those filled 0's differently from 0's which were a part of your original image.
Hope it Helps!

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