图像的读入与写出

 Mat source = Highgui.imread("C://opencv3.1//samples//sample.png");
         List<Mat> bgrList = new ArrayList<Mat>(3);

         System.out.println("channels="+source.channels());//gray=1,RGB=3
         System.out.println("total="+source.total());//col*row
         System.out.println("col="+source.cols());//col*row
         System.out.println("row="+source.rows());//col*row
         System.out.println("size="+source.size());//cols*rows,ex:9X10
         System.out.println("depth="+source.depth());//0
         System.out.println("type="+source.type());//16
         System.out.println("m="+source.dump());//(BGR,BGR......9组,9x3=27(col),row=10)

         Core.split(source, bgrList);//split 3 channels,R(2),G(1),B(0)
         System.out.println("blue="+bgrList.get(0).dump());//get only blue channel mat
         System.out.println("green="+bgrList.get(1).dump());//get only blue channel mat
         System.out.println("red="+bgrList.get(2).dump());//get only blue channel mat

         Highgui.imwrite("C://opencv3.1//samples//7.jpg", source);