Need to generate tform matrix from triangle parameters.

3 次查看（过去 30 天）
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?

请先登录，再回答此问题。

采纳的回答

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.
  5 个评论
显示 3更早的评论
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?

请先登录，再进行评论。

更多回答（1 个）

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

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Transforms 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by