3D image stack; determine mean of individual arrays; error code
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Hi,I have a 1000x1000x1952 uint8 3D image array (Array), and would like to get the mean value of each individual array "image" and subsequently put these in a 1952x1 array (meanArray).
The code I use is:
meanArray= mean(Array,[1 2])
the error code I get is: Error using sum "Dimension argument must be a positive integer scalar within indexing range. Error in mean (line 87) y = sum(x,dim,flag);"
What am I missing here? Thanks! Barry
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Matt J
am 5 Okt. 2018
Bearbeitet: Matt J
am 5 Okt. 2018
For some reason, mean was not written to let you operate along multiple dimensions in the same call. One alternative is to use sepblockfun (Download).
[m,n,p]=size(Array);
meanArray = sepblockfun(Array, [m,n,1], 'mean');
2 Kommentare
Matt J
am 9 Okt. 2018
@Janssen, if you look inside sepblockfun, you will see that it is equivalent to Stephen's proposal, but more general, in that it allows you take means/maxes over different block sizes. There is some overhead from this additional flexibility, which is why you might see slightly slower performance.
Weitere Antworten (2)
Stephen23
am 5 Okt. 2018
squeeze(mean(mean(Array,1),2))
2 Kommentare
Stephen23
am 9 Okt. 2018
Bearbeitet: Stephen23
am 9 Okt. 2018
@B Janssen: so you actually used my faster answer, but accepted Matt J's answer that you did not use? Confusing.
Note that you can also vote for answers, which is any easy way to show thanks to the volunteers who helped you. It is nice to get a vote as a small sign of appreciation.
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