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111 lines
4.6 KiB
Matlab
111 lines
4.6 KiB
Matlab
% FUNCTION img_stack = imrotate_ax(img_stack, angle, ax, val, method)
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% bilinear rotate stack of images along given axis
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% IMROTATE_AX bilinear rotate stack of images along given axis
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% img_stack = imrotate_fft(img, theta, axis,ax=3 val=0, method='bilinear')
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%
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% Inputs:
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% **img - stacked array of images to be rotated
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% **theta - rotation angle
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% **axis - rotation axis
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% *optional*
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% **val - fill missing values by this number
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% **method- interpolation method
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% *returns*:
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% ++img - rotated 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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%| |
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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_stack = imrotate_ax(img_stack, angle, ax, val, method)
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if nargin < 4
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val = 0;
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end
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if nargin < 3
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ax = 3;
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end
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if nargin < 5
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method = 'bilinear';
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end
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%% bilinear rotation along given axis
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N = size(img_stack,ax);
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if ~isa(img_stack, 'gpuArray')
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%% for CPU based rotation process the inputs slice by slice
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ind = {':',':',':'};
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for ii = 1:N
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if utils.verbose > 0; utils.progressbar(ii,N); end
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ind{ax} = ii;
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auxslice = squeeze(img_stack(ind{:}));
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if any(size(auxslice) ~= N)
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% pad in case of asymmetric input
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auxslice_pad = padarray( auxslice , [N N], val); % val is the background
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auxslice_pad = imrotate(auxslice_pad,angle,method,'crop');
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auxslice = auxslice_pad(N+1:end-N, N+1:end-N);
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else
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auxslice = imrotate(auxslice,angle,method,'crop');
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end
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img_stack(ind{:}) = auxslice;
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end
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else
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%% for GPU call directly the internal code for 2D interpolation and process the image block in one step
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if ax == 1
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img_stack = permute(img_stack, [3,2,1]); angle = - angle;
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elseif ax == 2
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img_stack = permute(img_stack, [1,3,2]);
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end
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outputSize = size(img_stack);
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if isreal(img_stack)
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img_stack = images.internal.gpu.imrotate(img_stack, angle, method, outputSize);
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else
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img_stack = complex(images.internal.gpu.imrotate(real(img_stack), angle, method, outputSize),...
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images.internal.gpu.imrotate(imag(img_stack), angle, method, outputSize));
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end
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if ax == 1
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img_stack = permute(img_stack, [3,2,1]);
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elseif ax == 2
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img_stack = permute(img_stack, [1,3,2]);
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end
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end |