[cv]Image transformation
Image transform
image warping
similarity transformation
A perspective transformation is a homography when the content of the image is on a plane.
In pixel coordinates, (0,0) is located at top left.
The DOF is 8 in a homography transformation.
How many points are necessary to compute a homography? 4 points, 8 equations.
Here is a good tutorial for computing homography matrix.
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