In imtransform what is the position of input point in the output image.

Hi,

I am using imtransform to perform a projective transformation

I = imread('cameraman.tif');
udata = [0 1];  vdata = [0 1];

tform = maketform('projective',[ 0 0;  1  0;  1  1; 0 1],...
                               [0 -0.1; 1 0 ; 1 1; 0 1.1]);

[B,xdata,ydata] = imtransform(I, tform, 'bicubic', 'udata', udata,'vdata', vdata,'FillValues', 0.5);

   imshow(I,'XData',udata,'YData',vdata), ...
     axis on 
  figure
   imshow(B,'XData',xdata,'YData',ydata), ...
     axis on

but i wanted know to if i have a point suppose (u,v)=(10,10) where will this point go in the output image.

Answer 1

[Walter Roberson]

Uvec = 10;
Vvec = 10;
[Uproj, Vproj] = tformfwd(tform, Uvec(:), Vvec(:));

If I interpret the documentation correctly, that is.