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I find the Core.line doesn't work in opencv 3.1 in java verison. What should it be? Thanks.

Mat Img = new Mat();
Point pt1 = new Point(x1, y1);
Point pt2 = new Point(x2, y2);
Core.line(Img, pt1, pt2, new Scalar(0,255,0), 3);

I find the Core.line doesn't work in opencv 3.1 in for java verison. What should it be? Thanks.

Mat Img = new Mat();
Point pt1 = new Point(x1, y1);
Point pt2 = new Point(x2, y2);
Core.line(Img, pt1, pt2, new Scalar(0,255,0), 3);