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What is the reverse of warpPerspective ?

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Hi all ! At the bottom of this [link](http://docs.opencv.org/3.1.0/da/d6e/tutorial_py_geometric_transformations.html), a transformation extract the sudoku in "full screen". I would like to draw some text on the extracted sudoku and **re introduce** it in the big picture. Do you know how can I **re introduce** it ? Thank you !

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