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First of all you can check this example.
It is possible that a projected point lies beyond the border of the original image. You can use a bigger resulting image to see the projected points.
If you are unsure about the behavior of the function you can check the projection of a point on which the homography is based so sticking to the above example one object point has to be projected to one scene point.
Earlier I have started to work with a really simple case to understand what is going on inside: e. g. an almost identity matrix. Then I have used more and more complex transformations.
