Brielle asked . 2020-07-15

How to transform given XY coordinates using 'lwm' tform?

Hi, I have a set of XY coordinates, how do we transform given XY coordinates using 'lwm' tform?

ROI_Coordinates_XY=[1,2; 2,3; 4,5; 6,7; 1,0; 1,6]; %XY coordinates that need to be transformed
img1=imread('img1');
img2=imread('img2');
cpselect(img1, img2) %selecting control points 
keyboard 
img1_coordinates=movingPoints; clear movingPoints %save control points
img2_coordinates=fixedPoints;clear fixedPoints %save fixed points
tform_LWM = fitgeotrans(img1_coordinates, img2_coordinates, 'lwm', 10); %calculate tform using 'lwm'
%Tranform ROI_Coordinates_XY using the same tform_LWM.
tform_ed_XY = Help_function (tform_LWM, ROI_Coordinates_XY); 
%I am looking for a function like transformPointsForward for tform_LWM.

matlab, image processing

Expert Answer

John Michell answered . 2024-12-21 02:16:59

A forward version of the lwm transform is not provided because it is not guaranteed to be a 1-1 transformation, but perhaps it would be useful to you simply to do the inverse fit

tform_inv = fitgeotrans(img2_coordinates, img1_coordinates, 'lwm', 10);

and then apply transformPointsInverse.

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