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How do I apply a fitgeotrans output or similar to points NOT an image?

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Right Grievous
Right Grievous el 18 de Jun. de 2016
Editada: kuroshiba el 2 de Dic. de 2022
Hi everybody,
I have been using the fitgeotrans function to find the best linear weighted mean transformation between two sets of points.
This works really well when I use the imwarp function to warp an image, however, I also need to perform the same transformation on x,y points - this is proving difficult.
The tform output of fitgeotrans does not seem to have any transformPointsForward method, all it has is a transformPointsInverse method, which is not useful for me.
I think I must be missing something, the fitgeotrans function is using point coordinates to calculate the transformation, so surely it should be as easy to apply this to coordinates as well as images, if not easier?
Thanks for any help,
Rod.

Respuestas (1)

Catalina Vajiac
Catalina Vajiac el 24 de Jun. de 2016
There is a transformPointsForward function that you can use on your data points. The issue is that they are then defined in world coordinates, not intrinsic coordinates, so you must also use the worldToIntrinsic function, like this:
[B,RB]=imwarp(A,tform);
[xdataT,ydataT]=transformPointsForward(tform,xdata,ydata);
[xdataI,ydataI]=worldToIntrinsic(RB,xdataT,ydataT);
where tform is the output from fitgeotrans and RB is a spacial referencing object.
  5 comentarios
Sudip Paudel
Sudip Paudel el 27 de Mayo de 2020
Editada: Sudip Paudel el 27 de Mayo de 2020
I ran into the same issue and tried this method. However, it did not work for me because I am using transformation type 'lwm'. Is there another approach to solve this issue?
kuroshiba
kuroshiba el 2 de Dic. de 2022
Editada: kuroshiba el 2 de Dic. de 2022
Thank you gentleman! I was helped by you!

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