C#联合OpenCV（二）绘制直线、圆形、矩形、文字、带箭头的直线

选择图片

绘制时共有的默认参数

比如矩形

public static void Rectangle(Mat img, Rect rect,

Scalar color, 绘制的颜色

int thickness = 1, 绘制线条的粗细，如果为-1则填充区域

LineTypes lineType = LineTypes.Link8, 绘制类型 默认选择8连通域

int shift = 0)  绘制中心点的小数点位数，默认为0  如果中心点不是整数可以进行修改

 public static void Drawimage()
        {
            var Src_Images = Cv2.ImRead("lenna.png");

          

            //绘制矩形***********************************
            //使用Point的方式
            OpenCvSharp.Point p1 = new OpenCvSharp.Point(10, 10);
            OpenCvSharp.Point p2 = new OpenCvSharp.Point(20, 20);
            Cv2.Rectangle(Src_Images, p1, p2, Scalar.Green);
            //使用Rect的方式
            Rect roi = new Rect(100, 100, 150, 150);
            Cv2.Rectangle(Src_Images, roi, Scalar.Green);
            //***********************************

            //绘制矩形圆
            //使用中心点+直径的方式
            OpenCvSharp.Point Centerp1 = new OpenCvSharp.Point(10, 10);
            Cv2.Circle(Src_Images, Centerp1, 10, Scalar.Green );
            //使用int 中心点+直径的方式
            Cv2.Circle(Src_Images, 50, 50, 10, Scalar.Green);

            //绘制椭圆
            OpenCvSharp.Point Centerp2 = new OpenCvSharp.Point(100, 100);
            Cv2.Ellipse(Src_Images, Centerp2, new OpenCvSharp.Size(30, 10), 0, 0, 360, Scalar.Green);
            OpenCvSharp.Point Centerp = new OpenCvSharp.Point(120, 120);
            RotatedRect elip = new RotatedRect(Centerp, new Size2f(10, 30), 0);
            Cv2.Ellipse(Src_Images, elip, Scalar.Green);
            //绘制直线
            Cv2.Line(Src_Images, 120, 120, 200, 200, Scalar.Red);
            Cv2.Line(Src_Images, new OpenCvSharp.Point(100, 300), new OpenCvSharp.Point(200, 200), Scalar.Red);
            //添加文本
            Cv2.PutText(Src_Images, "123456", new Point(100,100), HersheyFonts.HersheyComplex, 1, Scalar.AliceBlue);
            //绘制带箭头的直线
            Cv2.ArrowedLine(Src_Images, new OpenCvSharp.Point(300, 100), new OpenCvSharp.Point(200, 200), Scalar.Red);
            //  Cv2.ImShow("原图", Src_Images);
            Cv2.ImShow("绘制后的图像", Src_Images);
        }