How to delete point(already inserted) in subdiv2d (python)

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I implemented subdiv2d and insert some points as the following way to construct Delaunay triangulation.

    size = img.shape
    rect = (0, 0, size[0], size[1])
    subdiv  = cv2.Subdiv2D(rect)
    points = []
    x = 0
    while(x<size[0]):
        y = 0
        while(y<size[1]):
            points.append((x, y))
            y = (y + 50)
        points.append((x, size[1]-1))
        x = x + 50

subdiv.insert(points)

I want to remove some points after that, let's assume I want to remove (0, 0), or (50,50) point from subdiv, that I already inserted through point array. How can I do this? please help me.