Warping an image to a specified size

I have an input image and have found the corners of the object I want to segment. I would like to transform the segmented object to a 500x500 image.

C = corner(mask,'Harris',4);
OutputC = [0 0; 500 0; 0 500; 500 500];
figure, imshow(mask), hold on
plot(C(:,1), C(:,2),'r*');

Tform2 = fitgeotrans(C,OutputC,'projective');
iout = imwarp(I1,Tform2);
figure;
imshow(iout);

The resulting output image is not my 500x500 size and I'm not sure why.

Should I be using a calculated homography matrix and applying that to my input image?

Answer 1

[KSSV]

doc imresize .You can change the dimensions to your desired size using this.

[andrew Kwon]

The problem with using imresize is that I will have more severe cases. Specifically the object I want to segment will have a lot of shear and rotational error. I must use a homography to get a more visible view of the object.

[andrew Kwon]

I figured out that the problem was because I was not matching the same corners in the input to the output image.