opencvsharp 根据row方向和面积筛选连通域的两种方式

ConnectedComponents cc = Cv2.ConnectedComponentsEx(tempMat);//相当于halcon的connection获取全部连通域
int blobnumber=cc.Blobs.Count;//获取数量
//List<ConnectedComponents.Blob> Bloblists = cc.Blobs.OrderByDescending(t => t.Area).ToList();面积排序
//List<ConnectedComponents.Blob> Bloblist = Bloblists.Where(t => t.Area < 800).ToList(); //筛选面积
List<ConnectedComponents.Blob> newblobsRight = cc.Blobs.OrderByDescending(b => b.Left).Skip(blobnumber - 2).Take(blobnumber-1).ToList();
List<ConnectedComponents.Blob> newblobsLeft = cc.Blobs.OrderByDescending(b => b.Left).Take(1).ToList();
List<ConnectedComponents.Blob> newblobsRightList = cc.Blobs.OrderByDescending(b => b.Left).ToList();
//newblobsRightList.Reverse();
ConnectedComponents.Blob testBlob = newblobsRightList[0];
Mat testMat = Mat.Zeros(grayImage.Height, grayImage.Width, MatType.CV_8UC1);
Mat tmat = new Mat();

//cc.FilterBlobs(tempMat, tmat, newblobsLeft);//生成blob list的mat
cc.FilterByBlob(tempMat, tmat, testBlob);//生成blob的mat