How to change image shape in form of V?

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h612
h612 on 6 Apr 2017
Commented: Guillaume on 6 Apr 2017
Filters, such as fisheye filter can shape the image with fisheye distortion. Is there a filter in which the image can look squeezed from bottom and wide from top? Such as a V?

Accepted Answer

Guillaume
Guillaume on 6 Apr 2017
Use imwarp with a projective2d transform:
I = checkerboard(40);
transform = fitgeotrans([1, 1; size(I, 2), 1; 1, size(I, 1); size(I)], ...
[1, 1; size(I, 2), 1; 100, size(I, 1); size(I, 2)-100, size(I, 1)], ...
'projective');
imshowpair(I, imwarp(I, transform), 'montage')
  5 Comments
Guillaume
Guillaume on 6 Apr 2017
I still have no idea what you want to interpolate in the black region. There is nothing there to interpolate. If you want to smear the edge of the image, you can use the older tformarray with a resampler that 'replicate' values.
transform = maketform('projective', ...
[1, 1; size(I, 2), 1; 1, size(I, 1); size(I)], ...
[1, 1; size(I, 2), 1; 100, size(I, 1); size(I, 2)-100, size(I, 1)]);
resampler = makeresampler('cubic', 'replicate');
imshowpair(I, tformarray(I, transform, resampler, [2 1], [2 1], [], []), 'montage');
However, note that most of these functions are deprecated. I don't know how to do the same with the new imwarp.

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