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Transform a 3d volume by using an affine transformation matrix 1.0

  Date Added: May 28, 2013  |  Visits: 176

Transform a 3d volume by using an affine transformation matrix

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This function transforms volume 'old_im' by means of affine transformation matrix 'M'. The output volume can be sub- and oversampled. The function makes use of interp3, so 'nearest', 'linear', 'spline', 'cubic' and fast ( * ) interpolation is possible.% Usage example - simple translationload mri.matD = squeeze(D(:,:,1,:));% Create affine transformation matrix, simply shift (x,y) = (50,25)M = [1 0 0 50; 0 1 0 25; 0 0 1 0; 0 0 0 1];% Invert M, since the interpolation is backward. Meanwhile subsample the output volume x-direction by a factor of two.D_new = affine3d(D,inv(M),1:2:128,1:128,1:27);figuresubplot(1,2,1)imagesc(D(:,:,10))title('Original volume')subplot(1,2,2)imagesc(D_new(:,:,10))title('Shifted volume')

Requirements: No special requirements
Platforms: Matlab
Keyword: Backward Create Invert Shift Simply Squeezed Subsample Xdirection
Users rating: 0/10

License: Shareware Size: 10 KB
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