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How to track a letter T

I want to use Contour Matching.
I need compute coordinate of center and rotation angle of contour.

Contour Matching is Hu Moment, and are there more algorithm?
For coordinate of center, only use MinAreaRect.
But the rotation angle of MinAreaRect, same time is error, especially when angle is more than 45 degree.
How to do it???
Thanks a lot

How to track a letter T

I want to use Contour Matching.
I need compute coordinate of center and rotation angle of contour.

Contour Matching is Hu Moment, and are there more algorithm?
For coordinate of center, only use MinAreaRect.
But the rotation angle of MinAreaRect, same time is error, especially when angle is more than 45 degree.
How to do it???
Thanks a lot