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Need to generate tform matrix from triangle parameters.

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Marshall
Marshall 2016-1-19
评论： Marshall 2016-1-29
If a user draws a triangle with parameters b, h and theta and wants to change an entire image via a transformation from a new triangle with user inputed parameters b', h', theta'. How can the transformation matrix be found?

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Matt J
Matt J 2016-1-20
编辑：Matt J 2016-1-20
The corners of each triangle are separated by vectors dy and dx. There is some 2x2 matrix A which transforms them from triangle 1 to triangle 2,
dy2=A*dy1
dx2=A*dx1
These are linear equations in the unknown A, which you can solve.
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Matt J
Matt J 2016-1-21
编辑：Matt J 2016-1-22
would it be possible to use your absor function for this vary problem?
Only if theta doesn't transform. Otherwise, the transformation is not a pure rotation.
Marshall
Marshall 2016-1-29
Matt J I have since managed to solve for the matrix A how can then use this matrix to generate a matrix for an image?

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Matt J
Matt J 2016-1-20
Why not use fitgeotrans, like you were advised here?
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Marshall
Marshall 2016-1-20
I don't have the version of matlabwith fitgeotrans. I need to find someway without using two images.

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