mirror of
https://github.com/c-sooyoung/fold_slice.git
synced 2026-09-17 21:39:08 +09:00
110 lines
4.1 KiB
Matlab
110 lines
4.1 KiB
Matlab
% IMSHIFT_LINEAR will apply shift that can be different for
|
||
% each frame.
|
||
% + compared to imshift_fft, it does not have periodic boundary
|
||
% + it is based on linear interpolation, so it can be run fast on GPU
|
||
% + integer shift is equivalent to imshift_fft (up to the boundary condition)
|
||
% - it needs for-loop for each frame -> it gets slow on GPU for
|
||
% shifting my small images. In that case imshift_fft can be faster.
|
||
%
|
||
% img = imshift_linear(img, x,y, method)
|
||
%
|
||
% Inputs:
|
||
% **img input image / stack of images
|
||
% **x applied shift or vector of shifts for each frame
|
||
% **y applied shift or vector of shifts for each frame
|
||
% **method choose interpolation method: nearest, {linear}, cubic , circ
|
||
%
|
||
% *returns*:
|
||
% ++img shifted image / stack of images
|
||
%
|
||
% see also: utils.imshift_fast, utils.imshift_fft
|
||
|
||
|
||
|
||
|
||
%*-----------------------------------------------------------------------*
|
||
%| |
|
||
%| 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 img = imshift_linear(img, x,y, method)
|
||
|
||
|
||
if nargin < 3
|
||
y = x(:,2);
|
||
x = x(:,1);
|
||
end
|
||
if nargin < 4
|
||
method = 'linear';
|
||
end
|
||
|
||
if all(x==0) && all(y==0)
|
||
return
|
||
end
|
||
|
||
|
||
real_img = isreal(img);
|
||
[Nx, Ny,Nlayers] = size(img);
|
||
|
||
if isscalar(x)
|
||
x = ones(Nlayers,1) * x;
|
||
end
|
||
if isscalar(y)
|
||
y = ones(Nlayers,1) * y;
|
||
end
|
||
|
||
if strcmpi(method, 'circ')
|
||
% perform fast shift with circular boundary condition
|
||
X = 1:Nx;
|
||
Y = 1:Ny;
|
||
for ii = 1:Nlayers
|
||
img(:,:,ii) = img(circshift(X,round(y(ii))), ...
|
||
circshift(Y,round(x(ii))),ii);
|
||
end
|
||
else
|
||
|
||
for ii = 1:Nlayers
|
||
%x(ii)
|
||
%y(ii)
|
||
img(:,:,ii) = interp2(single(img(:,:,ii)), single(-x(ii)+(1:Ny)),single(-y(ii)+(1:Nx)'), method,0);
|
||
end
|
||
|
||
end
|
||
|
||
|
||
|
||
|
||
end
|