How to change image shape in form of V?

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h612 2017-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/334024-how-to-change-image-shape-in-form-of-v

评论： Guillaume 2017-4-6

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?

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Answer 1

Guillaume 2017-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/334024-how-to-change-image-shape-in-form-of-v#answer_262016

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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')

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h612 2017-4-6

imwrap_result.jpg

I'm attaching the result. The black region can be seen in the result. I am wondering how can I not have that region 0- infact some interpolation of the neighbouring pixels

Guillaume 2017-4-6

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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');