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pythonopencvdistortion

undistorting/ dewarping a picture with 4 points on a plane

I'd like to dewarp an image using python (opencv/PIL etc.). I have 4 points of which I know that they should form a rectangular on a plane.

In gimp I can manually dewarp the picture usingbackwards-correction, but I'd like to write a program, that doesn't rely on gimp.

All the functions I have found rely on a transformation matrix, so I guess it would be sufficient to give me some pointers on how to calculate the correct matrix.

Greets & thanks for the help

Solution

  • To calculate this matrix, use :

    cv2.getPerspectiveTransform(src, dst)

    With src a list containing your 4 points and dst a list containing the corners of the new image. Be careful, they must be in the right order