MatOfPoint matPt = contours.get(i)

       minRect.set(i, Imgproc.fitEllipse( new  MatOfPoint2f(matPt) ));

       ——  MatOfPoint作为minAreaRect的参数总是报错"throw new IllegalArgumentException("Incomatible Mat");

  "     ref: ，不能直接把 MatOfPoint作为MatOfPoint2f的构造函数的参数

          解决方法为MatOfPoint率MatOfPoint2f 改为 

          MatOfPoint matPt = contours.get(i);

          MatOfPoint2f NewMtx = new MatOfPoint2f( matPt.toArray() );

             minRect.add(Imgproc.minAreaRect(NewMtx));