def to_keypoints(self):
<EOL>from imgaug.augmentables.kps import Keypoint<EOL>return [<EOL>Keypoint(x=self.x1, y=self.y1),<EOL>Keypoint(x=self.x2, y=self.y1),<EOL>Keypoint(x=self.x2, y=self.y2),<EOL>Keypoint(x=self.x1, y=self.y2)<EOL>]<EOL>
Convert the corners of the bounding box to keypoints (clockwise, starting at top left).

Returns
-------
list of imgaug.Keypoint
    Corners of the bounding box as keypoints.