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86 lines
3.9 KiB
Matlab
86 lines
3.9 KiB
Matlab
% AFFINE_DEFORM_FFT apply accurate affine deformation on image
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% use only for minor corrections !!
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%
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% img = affine_deform_fft(img, affine_matrix, shift)
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%
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% Inputs:
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% **img - 2D or stack of 2D images
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% **affine_matrix - 2x2xN affine matrix
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% **shift - Nx2 vector of shifts to be applied
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% *returns*:
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% ++img - deformed image
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |f
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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function img = imdeform_affine_fft(img, affine_matrix, shift)
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import utils.*
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if nargin < 3
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shift = [];
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end
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if ~isempty(shift)
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img = imshift_fft(img, shift);
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end
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if ~isempty(affine_matrix)
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if size(affine_matrix,3)>1
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for i=1:size(affine_matrix,3)
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[scale, asymmetry, rotation, shear] = math.decompose_affine_matrix(double(gather(affine_matrix(:,:,i))));
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if any(abs(scale(:)-1) > 1e-5)
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img(:,:,i) = imrescale_frft(img(:,:,i), scale, scale.*asymmetry);
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end
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if any(abs(shear(:)) > 1e-5)
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img(:,:,i) = imshear_fft(img(:,:,i),shear,1);
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end
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if any(abs(rotation(:))> 1e-5)
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img(:,:,i) = imrotate_ax_fft(img(:,:,i),rotation,3);
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end
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end
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else
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[scale, asymmetry, rotation, shear] = math.decompose_affine_matrix(double(gather(affine_matrix)));
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if any(abs(scale(:)-1) > 1e-5)
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img = imrescale_frft(img, scale, scale.*asymmetry);
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end
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if any(abs(shear(:)) > 1e-5)
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img = imshear_fft(img,shear,1);
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end
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if any(abs(rotation(:))> 1e-5)
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img = imrotate_ax_fft(img,rotation,3);
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end
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end
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end
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end |