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28 lines
824 B
Matlab
28 lines
824 B
Matlab
function [x,idx] = fftshift_2D(x)
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% -----------------------------------------------------------------------
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% This file is part of the PTYCHOMAT Toolbox
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% Author: Michal Odstrcil, 2016
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% License: Open Source under GPLv3
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% Contact: ptychomat@gmail.com
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% Website: https://bitbucket.org/michalodstrcil/ptychomat
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% -----------------------------------------------------------------------
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% Description: faster version of matlab fftshift to work for stack of
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% 2D images
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% Inputs: 2D or stack of 2D images
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% Outputs:
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% x - 2D or stack of 2D images after fftshift along first 2 dimensions
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% idx - precalculated indices for fftshift operation
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numDims = 2;
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idx = cell(1, numDims);
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for k = 1:numDims
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m = size(x, k);
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p = ceil(m/2);
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idx{k} = [p+1:m 1:p];
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end
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x = x(idx{:},:,:);
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end
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