I went through this thread Mapping Irregular Quadrilateral to a Rectangle
If i know the 4 corresponding points in image say
then how to compute pi(x,y) from pi'(x,y)
i don't know how to compute elements in Homography matrix H from those 8 known points
[x']= [h11 h12 h13] [x]
[y']= [h21 h22 h23] [y]
[(1)]=[h31 h32 (1)] [(1)]
[Excuse me. I am not sure if I should extend this question, or create a new one, since I can't post comments on threads]
I want to ask the same question, but using absolute values so I can visualize it. Lets say my points on the image plane are:
p = x:407 y:253 p = x:386 y:253 p = x:406 y:232 p = x:385 y:232
these points are in a 500px width x 333px height image plane with 0,0 at top left corner. These points represents a picture of a real plane where a 30mm side square are located. Assuming this picture was taken by a fixed camera at origin heading Z axis.
So, I know the physical distance between p0,p1 ; p0,p2 ; p1,p3; p2,p3 are 30mm.
But is it possible to get the X,Y,Z from each of these points using only this information above?