TIEVisionKeyPoint = packed record
    pt: TIEVisionPoint2f; // coordinates of the keypoints
    size: single;         // diameter of the meaningful keypoint neighborhood
    angle: single;        // computed orientation of the keypoint (-1 if not applicable); it's in [0,360) degrees and measured relative to image coordinate system, ie in clockwise.
    response: single;     // the response by which the most strong keypoints have been selected. Can be used for the further sorting or subsampling
    octave: int32_t;      // octave (pyramid layer) from which the keypoint has been extracted
    class_id: int32_t;    // object class (if the keypoints need to be clustered by an object they belong to)
  end;

pt: TIEVisionPoint2f