Perspective correction using Matlab

Question

After bounding natural images with textboxes (green), I want to apply a homography matrix (perspective correction) to project the green area to a rectangle.

Please refer to the link for the image mentioned above

https://i.stack.imgur.com/nhe4S.jpg

How can I implement the code / call the code in

http://www.mathworks.com/matlabcentral/answers/26141-homography-matrix

Alternatively, any other possibilities of other suitable algorithms?

I can provide you with the coordinates of the bounding box, obtained with

img=imread('perspective.jpg');
imshow(img); ginput(4)

and the coordinates of the quadrangle is

ans =

   23.1597   25.0459
   22.0220   55.9541
  164.2375   61.6427
  165.3752   30.1657

Answer 1

You can compute the homography transformation between the two bounding boxes using the fitgeotrans function. You can then apply the resulting transformation to the image using imwarp.