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Highlights from
B-spline Grid, Image and Point based Registration

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from B-spline Grid, Image and Point based Registration by Dirk-Jan Kroon
B-spline registration of two 2D / 3D images or corrsp. points, affine and with smooth b-spline grid.

Iout=affine_transform(Iin,M,mode) 
function Iout=affine_transform(Iin,M,mode)
% Function affine_transform, is a wrapper of the (mex) functions
% affine_transform_2d_double and affine_transform_3d mex functions
%
% Iout = affine_transform(Iin,M,mode)
%
% inputs,
%   Iin :  Input image.
%   M : Transformation matrix
%   mode: If 0: linear interpolation and outside pixels set to nearest pixel
%            1: linear interpolation and outside pixels set to zero
%            2: cubic interpolation and outside pixels set to nearest pixel
%            3: cubic interpolation and outside pixels set to zero
%
%
% outputs,
%   Iout: Output image
%
% Function is written by D.Kroon University of Twente (September 2008)

if(~exist('mode','var')), mode=0; end
if(size(Iin,3)<4)
    if(~isa(Iin,'double')), Iin=im2double(Iin); end
	Iout=affine_transform_2d_double(double(Iin),double(M),double(mode));
else
    if(isa(Iin,'double'))
		Iout=affine_transform_3d_double(double(Iin),double(M),double(mode));
    else
		Iout=affine_transform_3d_single(single(Iin),single(M),single(mode));
    end
end

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