C#：切割图像

一、生成6个圆环

• 在圆环上部加上标签，使圆环能够分辨差异。

        private void uiButton1_Click(object sender, EventArgs e)
        {
            Scalar s = new Scalar(155, 155, 155);//创建一个颜色对象
            OpenCvSharp.Scalar scalar = new OpenCvSharp.Scalar(0, 0,0);
            Mat mm = new Mat(1000, 2000, MatType.CV_8UC3, s);
            for(int i=0;i<6;i++)
            { Cv2.Circle(mm, 200+i*300, 500, 50, scalar, 30);
              Cv2.PutText(mm, (i+1).ToString(), new OpenCvSharp.Point(190 + i * 300, 430), 0, 1.25, new OpenCvSharp.Scalar(0, 0, 255), 2);
            }
            picShowOri.Image = mm.ToBitmap();
            src_img = new Mat();
            mm.CopyTo(src_img);
        }

二、结构定义

• 结构定义及结构数组变量的申明；
• 保存检测圆的序号，圆心坐标，半径信息。
  public struct CircleSegment0
  { public Point2f Center;
  public float Radius;
  } ;
  CircleSegment0[] cs0 = new CircleSegment0[10];

//------
                    cs0[i].Center = cs[i].Center;
                    cs0[i].Radius = cs[i].Radius;

                    int x0 = (int)cs[i].Center.X;
                    int y0 = (int)cs[i].Center.Y;
                    //显示圆心坐标
                    Cv2.PutText(dst, i.ToString()+"(" + x0.ToString() + "," + y0.ToString() + ")", new OpenCvSharp.Point(x0-100, y0 + 200), 0, 1.25, new OpenCvSharp.Scalar(0, 0, 255), 2);

三、切割

• 选择感兴趣的区域进行切割，识别圆的序号有些不同，改进时需要排序。

        private void uiButton3_Click(object sender, EventArgs e)
        {
            int k0= uiComboBox1.Text.ToInt();
            int x0 = (int)cs0[k0].Center.X;
            int y0= (int)cs0[k0].Center.Y;
            int r0 = (int)cs0[k0].Radius;
            OpenCvSharp.Rect roi = new OpenCvSharp.Rect(x0 - r0 - 50,y0 - r0 - 50, 2*(r0 + 50), 2 * (r0 + 50));
            Mat ImageROI = new Mat(src_img, roi);//新建一个mat，把roi内的图像加载到里面去
            pictureBox1.Image = ImageROI.ToBitmap();
        }