How to find projective transformation with 4 points?

Hi,

I need some help for fitgeotrans() function. I have this image:

this is a 902x902 image. I cropped it from an ortophoto.

and I want to project this image specify to the camrea parameters, to get an image like to take the picture the airplane's camera and get something like this:

my code is the following:

quadrangle = [1 902; ...

902 902;...

902 1;...

1 1];

cam_width = 4096;

cam_height = 2160;

trf = fitgeotrans(quadrangle, [1 1; 1 cam_width; cam_height cam_width; cam_height 1],'projective');

projectedIm = imwarp(map.pic, trf, 'OutputView', imref2d([cam_height, cam_width]));

I allways get this:

It is clear that I am missing something:/

Answer 1

[Tarunbir Gambhir]

Since the image is rotated 90 degrees clockwise, the scaled "height" and "width" should be interchanged while specifying the fixed points in fitgeotrans function.

Change the "trf" variable as following:

trf = fitgeotrans(quadrangle, [1 1; 1 cam_height; cam_width cam_height; cam_width 1],'projective');