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tomo/+lamino/get_lamino_fourier_mask.m

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+% fft_mask = get_lamino_fourier_mask( Npix, lamino_angle, keep_on_GPU)
+% find the missing cone mask based on provided inputs 
+% Inputs:
+%    **Npix             - (3x1 int) volume size 
+%    **lamino_angle     - (scalar), laminography angle from 0 to 90degrees, 90 == classical tomo, it is used to calculate the missing cone  
+%    **keep_on_GPU      - (bool) move the mask to GPU and keep it there 
+% *returns*
+%   ++fft_mask = mask in the fourier space 
+%
+% Example: 
+%   ifftn(fftn(volume).*fft_mask)
+
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  Except where otherwise noted, this work is licensed under a          |
+%|  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
+%|  International (CC BY-NC-SA 4.0) license.                             |
+%|                                                                       |
+%|  Copyright (c) 2018 by Paul Scherrer Institute (http://www.psi.ch)    |
+%|                                                                       |
+%|       Author: CXS group, PSI                                          |
+%*-----------------------------------------------------------------------*
+% You may use this code with the following provisions:
+%
+% If the code is fully or partially redistributed, or rewritten in another
+%   computing language this notice should be included in the redistribution.
+%
+% If this code, or subfunctions or parts of it, is used for research in a 
+%   publication or if it is fully or partially rewritten for another 
+%   computing language the authors and institution should be acknowledged 
+%   in written form in the publication: “Data processing was carried out 
+%   using the “cSAXS matlab package” developed by the CXS group,
+%   Paul Scherrer Institut, Switzerland.” 
+%   Variations on the latter text can be incorporated upon discussion with 
+%   the CXS group if needed to more specifically reflect the use of the package 
+%   for the published work.
+%
+% A publication that focuses on describing features, or parameters, that
+%    are already existing in the code should be first discussed with the
+%    authors.
+%   
+% This code and subroutines are part of a continuous development, they 
+%    are provided “as they are” without guarantees or liability on part
+%    of PSI or the authors. It is the user responsibility to ensure its 
+%    proper use and the correctness of the results.
+
+
+function fft_mask = get_lamino_fourier_mask( Npix, lamino_angle, keep_on_GPU)
+    if nargin < 3
+        keep_on_GPU = false; 
+    end
+
+    for i = 1:3
+        grid{i} = fftshift(linspace(-1,1,Npix(i)))';
+        grid{i} = shiftdim(grid{i},1-i);
+        if keep_on_GPU, grid{i} = utils.Garray(grid{i}); end
+    end
+    fft_mask = get_mask(grid{:}, lamino_angle);
+end
+
+
+function fft_mask = get_mask(xgrid, ygrid, zgrid, lamino_angle)
+    fft_mask = ceil(atand( abs(zgrid) ./ sqrt(xgrid.^2+ygrid.^2) )) > lamino_angle; 
+end