reduce samples on a 3d array

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Emmanouil Karamousadakis 2021-8-26

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https://ww2.mathworks.cn/matlabcentral/answers/1441229-reduce-samples-on-a-3d-array

评论： Wan Ji 2021-8-29

I have a 3d matrix containing temperature data. The first 2 dimensions are the the x,y, of my thermal camera, the 3rd dimention represents time.

It is a 160x120x30000. size

I cannot find a way to reduce its 3rd dimension size with some kind of interpolation, loosing data in between not at the ends. I would like to make it 160x120x28000 for example. Any ideas plz? I played aroud with griddedInterpolant and interp1 but I cannot figure it out.

Thank you!!

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Answer 1

Wan Ji 2021-8-26

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https://ww2.mathworks.cn/matlabcentral/answers/1441229-reduce-samples-on-a-3d-array#answer_775024

编辑：Wan Ji 2021-8-26

在 MATLAB Online 中打开

Use interp1 my friend, if a is the 160x120x30000 data that you said.

[m,n,p] = size(a);
a = reshape(a,m*n,p);
nSeries = p;
totalTime = nSeries - 1;
nSampled = 28000; % loosing data in between with 28000 samples
tSeries = linspace(0,totalTime,nSeries);
tSampled = linspace(0,totalTime,nSampled);
a = interp1(tSeries,a',tSampled);
a = reshape(a',m,n,nSampled); % this is the data resampled 160x120x28000