CODEWITHSUNDEEP
matlabimage-processingmatrixregistrationtransformation
chaohuang
chaohuang

Reputation: 4115

obtain transformation matrix from control points

We can construct a 'TFORM' structure using control points via the 'cp2tform' function, however I am wondering if we can obtain the explicit transformation matrix form, not the 'TFORM' structure, so that I can compute the pixel size of the transformed image from the original image, where the pixel size dx does not equal dy.

Upvotes: 1

Views: 1123

Answers (1)

Amro
Amro

Reputation: 124563

If TFORM is the structure returned, you can access the transformation matrices as:

TFORM.tdata.T

and

TFORM.tdata.Tinv

one for the forward transformation, the other its inverse.

You can edit maketform.m file in the IPT toolbox and see how they are used internally.

Upvotes: 2

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