class Program

    {

        static void Main(String[] args)

        {

            Mat img = CvInvoke.Imread(@"C:\Users\dell\Pictures\mach.jpg");

            Mat pic = new Mat();

            int ch=img.NumberOfChannels;

            VectorOfMat dst = new VectorOfMat(ch);

            CvInvoke.Split(img,dst);

            CvInvoke.Imshow("hello", img);

            Mat blue = dst[];

            Mat green = dst[];

            Mat red = dst[];

            CvInvoke.Threshold(blue, blue, , , ThresholdType.Binary);

            CvInvoke.Threshold(green, green, , , ThresholdType.Binary);

            CvInvoke.Threshold(red, red, , , ThresholdType.Binary);

            CvInvoke.Merge(dst, pic);

            CvInvoke.Imshow("b", blue);

            CvInvoke.Imshow("g", green);

            CvInvoke.Imshow("r", red);

            CvInvoke.Imshow("m", pic);

            CvInvoke.WaitKey();

        }

    }

    class Program

    {

        static void Main(String[] args)

        {

            Mat img = CvInvoke.Imread(@"C:\Users\dell\Pictures\mach.jpg");

            Mat logo = CvInvoke.Imread(@"C:\Users\dell\Pictures\opencv.jpg");

            Mat ROI = new Mat(img, new Rectangle(, , logo.Cols, logo.Rows));

            logo.CopyTo(ROI);

            CvInvoke.Imshow("roi", img);

            CvInvoke.WaitKey();

        }

    }

        static void Main(String[] args)

        {

            Mat img = CvInvoke.Imread(@"C:\Users\dell\Pictures\mach.jpg");

            Mat logo = CvInvoke.Imread(@"C:\Users\dell\Pictures\opencv.jpg");

            Mat mask = CvInvoke.Imread(@"C:\Users\dell\Pictures\opencv.jpg", );

            CvInvoke.BitwiseNot(mask, mask);//图像取反，白色变黑色

            CvInvoke.Imshow("mask", mask);

            CvInvoke.Threshold(mask, mask, , , ThresholdType.Binary);

            CvInvoke.Imshow("threshold", mask);

            Mat roi = new Mat(img, new Rectangle(, , logo.Cols, logo.Rows));

            logo.CopyTo(roi, mask);

            CvInvoke.Imshow("img", img);

            CvInvoke.WaitKey();

        }