C# OpenCvSharp 环形文字处理 直角坐标与极坐标转换

效果

效果1

效果2

项目

代码

using OpenCvSharp;
using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace OpenCvSharp_Demo
{
 public partial class frmMain : Form
 {
 public frmMain()
 {
 InitializeComponent();
 }

 string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";
 string image_path = "";

 DateTime dt1 = DateTime.Now;
 DateTime dt2 = DateTime.Now;

 Mat image;
 Mat result_image;

 StringBuilder sb = new StringBuilder();

 private void button1_Click(object sender, EventArgs e)
 {
 OpenFileDialog ofd = new OpenFileDialog();
 ofd.Filter = fileFilter;
if (ofd.ShowDialog() != DialogResult.OK) return;

 pictureBox1.Image = ;
 pictureBox2.Image = ;

 image_path = ofd.FileName;
 pictureBox1.Image = new Bitmap(image_path);
 image = new Mat(image_path);
 }

 private void button2_Click(object sender, EventArgs e)
 {
 image_path = "test_img/2.jpg";
 image = new Mat(image_path);
 pictureBox1.Image = new Bitmap(image_path);
 result_image = new Mat();

float h, w, cx, cy;
 h = (float)image.Height;
 w = (float)image.Width;

 //以图像中心点作为变换中心
 cx = w / 2;
 cy = h / 2;
 double maxR = Math.Max(cx, cy); // 最大变换半径

 Cv2.LinearPolar(image, result_image, new Point2f(cx, cy), maxR, InterpolationFlags.Linear);

 Cv2.Rotate(result_image, result_image, RotateFlags.Rotate90Counterclockwise);

 pictureBox2.Image = new Bitmap(result_image.ToMemoryStream());

 }

 private void button3_Click(object sender, EventArgs e)
 {
 image_path = "test_img/1.jpg";
 image = new Mat(image_path);
 pictureBox1.Image = new Bitmap(image_path);
 result_image = new Mat();

float h, w, cx, cy;
 h = (float)image.Height;
 w = (float)image.Width;

 //以图像中心点作为变换中心
 cx = w / 2;
 cy = h / 2;

 Cv2.LogPolar(image, result_image, new Point2f(cx, cy), 80, InterpolationFlags.Linear | InterpolationFlags.WarpFillOutliers);

 Cv2.Rotate(result_image, result_image, RotateFlags.Rotate90Counterclockwise);

 pictureBox2.Image = new Bitmap(result_image.ToMemoryStream());

 }

 private void pictureBox2_DoubleClick(object sender, EventArgs e)
 {
 //Common.ShowNormalImg(pictureBox2.Image);
 }

 private void pictureBox1_DoubleClick(object sender, EventArgs e)
 {
 //Common.ShowNormalImg(pictureBox1.Image);
 }

 }
}