Optimal distance calculation for a data cube

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Bradley Flynn
Bradley Flynn 2016-4-2
编辑： John BG 2016-4-2
I'm wondering if there's a better way to calculate my distance matrix?
function D = frame2frameDist(imageStack)
[h, w, c, l] = size(imageStack);
D = zeros(l);
for channel = 1:c
for i = 1:l
for j = i:l
D(i,j) = D(i,j) + norm(imageStack(:,:,channel,i)-imageStack(:,:,channel,j));
end;
end;
end;
D = triu(D)+triu(D,1)';
Is there a way to do this without iteration?
  1 个评论
John BG
John BG 2016-4-2
编辑：John BG 2016-4-2
have you tried
for i = 1:l
for j = i:l
D(i,j) = D(i,j) + norm(imageStack(:,:,:,i)-imageStack(:,:,:,j));
end;
end;
can you submit a sample of frames and channels?
also, functions bsxfun and arrayfun may have a way to combine the norm() and rid loops i and j.
There is an expert in this forum called Andrei Bobrov who showed me how to use bsxfun, may be you could ask him.

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回答（1 个）

Walter Roberson
Walter Roberson 2016-4-2
Possibly reshape to rows, and then pdist() ?

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