centerEdges(y, z, x, t) {
			//
			//       t            t
			//  z                      x
			//        x    OR    z
			//   y                    y
			//
			const yi = y.getX();
			const yj = y.getY();
			const zi = z.getX();
			const zj = z.getY();
			const xi = x.getX();
			const xj = x.getY();
			const ti = t.getX();
			const tj = t.getY();
			const CORR = WhiteRectangleDetector.CORR;
			if (yi < this.width / 2.0) {
				return [
					new ResultPoint(ti - CORR, tj + CORR),
					new ResultPoint(zi + CORR, zj + CORR),
					new ResultPoint(xi - CORR, xj - CORR),
					new ResultPoint(yi + CORR, yj - CORR)
				];
			}
			else {
				return [
					new ResultPoint(ti + CORR, tj + CORR),
					new ResultPoint(zi + CORR, zj - CORR),
					new ResultPoint(xi - CORR, xj + CORR),
					new ResultPoint(yi - CORR, yj - CORR)
				];
			}
		}
recenters the points of a constant distance towards the center

@param y bottom most point
@param z left most point
@param x right most point
@param t top most point
@return {@link ResultPoint}[] describing the corners of the rectangular
        region. The first and last points are opposed on the diagonal, as
        are the second and third. The first point will be the topmost
        point and the last, the bottommost. The second point will be
        leftmost and the third, the rightmost