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ptycho/utils/crop_pad_3D.m

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+% CROP_PAD_3D adjusts the size by zero padding or cropping
+%
+% [ imout ] = crop_pad_3D( img, outsize, varargin)
+% 
+% Inputs
+%   **img                input 3D volume
+%   **outsize            size of output volume
+%   **fill                  value to fill the padded regions 
+% Outputs
+%   ++imout               output volume after cropping / padding to size "outsize"
+% 
+%   Example : 
+%       volData = ones(100,100,100)
+%       [ volData_out ] = crop_pad_3D( volData, [50,50,200])
+%       size(volData_out) == [50,50,200]
+
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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) 2017 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 [ imout ] = crop_pad_3D( img, outsize, fill)
+
+if nargin < 1
+    fprintf('CROP_PAD: adjusts the size by zero padding or cropping\n');
+    fprintf('crop_pad(img, outsize)\n');
+    return
+end
+
+if nargin < 3
+    fill = 0;
+end
+
+Nout = outsize(1:3);
+
+Nin = size(img);
+
+if all(Nin ==Nout)  % dont do anything if input array size == output size 
+    imout = img;
+    return
+end
+
+center = floor(Nin(1:3)/2)+1;
+
+imout = zeros(outsize,'like',img) + fill;
+centerout = floor(Nout/2)+1;
+
+cenout_cen = centerout - center;
+imout(max(cenout_cen(1)+1,1):min(cenout_cen(1)+Nin(1),Nout(1)),...
+      max(cenout_cen(2)+1,1):min(cenout_cen(2)+Nin(2),Nout(2)),...
+      max(cenout_cen(3)+1,1):min(cenout_cen(3)+Nin(3),Nout(3))) ... 
+= img(max(-cenout_cen(1)+1,1):min(-cenout_cen(1)+Nout(1),Nin(1)),...
+      max(-cenout_cen(2)+1,1):min(-cenout_cen(2)+Nout(2),Nin(2)),...
+      max(-cenout_cen(3)+1,1):min(-cenout_cen(3)+Nout(3),Nin(3)));
+
+if ~isreal(img)
+    imout = complex(imout);
+end
+
+end
+