private static void Main(string[] args) { string fileName = "C:\\perspective_chessboard.jpg"; // Cv using (CvMat chessboard = new CvMat(fileName)) { Cv.ShowImage("Input_Cv", chessboard); CvPoint2D32f[] corners; if (Cv.FindChessboardCorners(chessboard, new Size(10, 7), out corners)) { using (CvMat dest = new CvMat(chessboard.Rows, chessboard.Cols, MatrixType.U8C3)) { CvPoint2D32f[] a = { corners[0], corners[60], corners[69], corners[9] }; foreach (var corner in a) { Cv.Circle(chessboard, corner, 5, new CvScalar(0, 0, 255)); } Cv.ShowImage("RectangleVertices_Cv", chessboard); CvPoint2D32f[] b = { new CvPoint2D32f(0, 0), new CvPoint2D32f(0, chessboard.Height), new CvPoint2D32f(chessboard.Width, chessboard.Height), new CvPoint2D32f(chessboard.Width, 0) }; CvMat map_matrix; Cv.GetPerspectiveTransform(a, b, out map_matrix); Cv.WarpPerspective(chessboard, dest, map_matrix, Interpolation.Linear | Interpolation.FillOutliers, CvScalar.ScalarAll(255)); //Succeed Cv.ReleaseMat(map_matrix); Cv.ShowImage("Output_Cv", dest); } //Cv.WaitKey(); } } //Cv2 using (Mat chessboard = new Mat(fileName)) { Point2f[] corners; if (Cv2.FindChessboardCorners(chessboard, new Size(10, 7), out corners)) { Point2f[] a = { corners[0], corners[60], corners[69], corners[9] }; foreach (var corner in a) { chessboard.Circle(corner, 5, new Scalar(0, 0, 255)); } Cv2.ImShow("RectangleVertices_Cv2", chessboard); //Cv2.WaitKey(); Point2f[] b = { new Point2f(0, 0), new Point2f(0, chessboard.Height), new Point2f(chessboard.Width, chessboard.Height), new Point2f(chessboard.Width, 0) }; using (Mat map_matrix = Cv2.GetPerspectiveTransform(a, b)) using (Mat dest = new Mat(new Size(640, 480), MatType.CV_8UC3)) { Cv2.WarpPerspective(chessboard, dest, map_matrix, dest.Size(), Interpolation.Linear | Interpolation.FillOutliers, BorderType.Default, Scalar.All(255)); //AccessViolation Cv2.ImShow("Output_Cv2", dest); } ////Another way (Using Mat.WarpPerspective()) //using (Mat map_matrix = Cv2.GetPerspectiveTransform(a, b)) //using (Mat dest = chessboard.WarpPerspective(map_matrix, new Size(640, 480), Interpolation.Linear | Interpolation.FillOutliers, BorderType.Default, Scalar.All(255))) //AccessViolation //{ // Cv2.ImShow("Output_Cv2", dest); //} Cv2.WaitKey(); } } //Track(); //Run(); }