transformPointsForward does not support Polynomial​Transforma​tion2D

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Juan de Jesus
Juan de Jesus 2025-1-30
评论： Matt J 2025-1-31
I would like to know why transformPointsForward does not support PolynomialTransformation2D as a transformation object. It is weird because transformPointsInverse does support PolynomialTransformation2D.
So the workaround is simple, instead of using:
tform = fitgeotform2d(movingPoints,fixedPoints,"polynomial",degree)
[x,y] = transformPointsForward(tform,u,v)
I used:
tform = fitgeotform2d(fixedPoints,movingPoints,"polynomial",degree)
[x,y] = transformPointsInverse(tform,u,v)
But it is still counterintuitive and increases the risk of making mistakes later in the code.
Please let me know if there is something I am overlooking or if this is really a missing functionality of the transformPointsForward function.
This is the error I am getting when using transformPointsForward:
Incorrect number or types of inputs or outputs for function transformPointsForward.

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采纳的回答

Matt J
Matt J 2025-1-30
编辑：Matt J 2025-1-30
Polynomial tforms are generally not invertible, so you can only define them in one direction. I assume fitgeotform2d always fits the inverse transform because it is the inverse, not the forward transform that is need to perform a forward imwarp() from the moving space to the fixed space.
  2 个评论
Juan de Jesus
Juan de Jesus 2025-1-31
Now that I think about it, it makes sense. That is the expected behavior from the polynomial fit. Thank you very much.
Matt J
Matt J 2025-1-31
You're welcome, but please Accept-click the answer if you consider your question resolved.

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