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[0];Mat green = dst[1];Mat red = dst[2];CvInvoke.Threshold(blue, blue, 200, 255, ThresholdType.Binary);CvInvoke.Threshold(green, green, 200, 255, ThresholdType.Binary);CvInvoke.Threshold(red, red, 200, 255, ThresholdType.Binary);CvInvoke.Merge(dst, pic);CvInvoke.Imshow("b", blue);CvInvoke.Imshow("g", green);CvInvoke.Imshow("r", red);CvInvoke.Imshow("m", pic);CvInvoke.WaitKey(0);}}

    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(20, 20, logo.Cols, logo.Rows));logo.CopyTo(ROI);CvInvoke.Imshow("roi", img);CvInvoke.WaitKey(0);}}

        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", 0);CvInvoke.BitwiseNot(mask, mask);//图像取反，白色变黑色CvInvoke.Imshow("mask", mask);CvInvoke.Threshold(mask, mask, 100, 255, ThresholdType.Binary);CvInvoke.Imshow("threshold", mask);Mat roi = new Mat(img, new Rectangle(20, 20, logo.Cols, logo.Rows));logo.CopyTo(roi, mask);CvInvoke.Imshow("img", img);CvInvoke.WaitKey(0);}