How to find landmarks of a rotated image?

I have an image that I placed five landmarks on and I rotated that image 30 degrees. How do I now find those five landmarks and note their position?

I = imread('peppers.png');
  RGB = insertMarker(I,[147 279]);
  pos   = [120 248;195 246;195 312;120 312];
  color = {'red','white','green','magenta'};
  RGB = insertMarker(RGB,pos,'x','color',color,'size',10);
  figure (1)
  imshow(RGB);
  title('5 Landmarks')
    J = imrotate(I,30,'bilinear','crop');
    figure (2)
    imshow(J)
    title('Rotated Image')

Answer 1

[Arun Mathamkode]

You can create a rotation matrix T and multiply the location vector of landmark points with T to find the locations of landmark points in the rotated image.

 theta = 30;
 T=[cosd(theta) sind(theta) ; ...
      -sind(theta) cosd(theta)];
 new_pos=(T*pos')';