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Is there a way to compute a RANSAC based affine transformation?

I know of findHomography(), but that computes all kinds of perspective transformations. I'd like to restrict the degrees of freedom to translation, rotation and scale.

There is a method estimateRigidTransform in the video module, but it's not RANSAC based.

Am I missing something?

Or do I have to implement it on my own?

Is there a way to compute a RANSAC based affine transformation?

I know of findHomography(), but that computes all kinds of perspective transformations. I'd like to restrict the degrees of freedom to translation, rotation and scale.

There is a method estimateRigidTransform in the video module, but it's not RANSAC based.

Am I missing something?

Or do I have to implement it on my own?