tx and ty are translation. I think a and d are scale and b and c are some function of rotation. I have videos that are flipped and rotated using arbitrary matrices. How can I make them right-side-up ...
Proceedings of the National Academy of Sciences of the United States of America, Vol. 17, No. 7 (Jul. 15, 1931), pp. 417-420 (4 pages) ...
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