C#联合OpenCV（四）图像的旋转 翻转 仿射变换

图像的翻转

public static void Forexample(){var Src_Images = Cv2.ImRead("lenna.png", ImreadModes.Color);var SRC = new Mat();var SRC1 = new Mat();Cv2.Flip(Src_Images, SRC, FlipMode.X);Cv2.Flip(Src_Images, SRC1, FlipMode.Y);Cv2.ImShow("1", Src_Images);Cv2.ImShow("2", SRC);Cv2.ImShow("3", SRC1);}

可以实现XY的转置翻转镜像

//转置矩阵public static void Transpose(InputArray src, OutputArray dst){//需要搭配使用Cv2.Flip(src,dst,FlipMode.XY);Cv2.Transpose(src, dst);}

图像的旋转

rotate 这个算子只能旋转固定的角度。90度180度270度

public static void Forexample(){var Src_Images = Cv2.ImRead("lenna.png", ImreadModes.Color);var SRC = new Mat();var SRC1 = new Mat();var SRC2 = new Mat();//90度Cv2.Rotate(Src_Images, SRC, RotateFlags.Rotate90Clockwise);//180度Cv2.Rotate(Src_Images, SRC2, RotateFlags.Rotate180);//270度Cv2.Rotate(Src_Images, SRC1, RotateFlags.Rotate90Counterclockwise);Cv2.ImShow("1", Src_Images);Cv2.ImShow("2", SRC);Cv2.ImShow("3", SRC1);Cv2.ImShow("4", SRC2);}

图像的任意角度旋转+仿射变换

//仿射变换//方法一 旋转缩放//Point center = new Point(SrcImage.Cols / 2, SrcImage.Rows / 2);//double angle =0;//double scale = 1;//Mat rot_mat = Cv2.GetRotationMatrix2D(center, angle, scale);//方法二 旋转平移缩放Point center = new Point(SrcImage.Cols / 2, SrcImage.Rows / 2);double angle = 60.0 / 180.0 * Cv2.PI;//旋转角度，正值表示逆时针旋转//旋转平移缩放Mat rot_mat = GetTransformRotationMatrix2D(center, 100, 0, 0, 1);Mat warp_rotate_dst =new Mat();Cv2.WarpAffine(SrcImage, warp_rotate_dst, rot_mat, SrcImage.Size());Cv2.ImShow("warp_rotate_dst", warp_rotate_dst);Cv2.ImShow("origindst", SrcImage);

旋转平移封装代码

public static Mat GetTransformRotationMatrix2D(OpenCvSharp.Point2f center, double Translation_X, double Translation_Y, double Rotate_Angle, double Scale = 1){Mat M = Mat.Zeros(2, 3, MatType.CV_64FC1);M.At<double>(0, 0) = (double)(Scale * Math.Cos(Rotate_Angle * Math.PI / 180));M.At<double>(0, 1) = -(double)(Scale * Math.Sin(Rotate_Angle * Math.PI / 180));M.At<double>(1, 0) = (double)(Scale * Math.Sin(Rotate_Angle * Math.PI / 180));M.At<double>(1, 1) = (double)(Scale * Math.Cos(Rotate_Angle * Math.PI / 180));M.At<double>(0, 2) = (double)((1 - M.At<double>(0, 0)) * center.X - M.At<double>(0, 1) * center.Y + Translation_X);M.At<double>(1, 2) = (double)(M.At<double>(0, 1) * center.X + (1 - M.At<double>(0, 0)) * center.Y + Translation_Y);return M;}

图像的平移

修改代码

Mat rot_mat = GetTransformRotationMatrix2D(center, 0, 0, 45, 1);

图像的旋转