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楼主 |
发表于 2023-7-5 17:06:51
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要进行畸变矫正,首先需要获取相机的畸变参数。一般来说,相机的畸变参数可以通过相机标定得到。相机标定是通过拍摄一组已知的特征点图像,并通过计算得到相机的内参和畸变参数。
以下是一个使用OpenCV库进行相机标定的示例代码:
csharp
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using OpenCvSharp;
namespace CameraCalibration
{
class Program
{
static void Main(string[] args)
{
// 设置标定板的尺寸
Size boardSize = new Size(9, 6);
// 创建标定板上角点的三维坐标
List<Point3f> objectPoints = new List<Point3f>();
for (int i = 0; i < boardSize.Height; i++)
{
for (int j = 0; j < boardSize.Width; j++)
{
objectPoints.Add(new Point3f(j, i, 0));
}
}
// 读取标定图像
List<Mat> calibrationImages = new List<Mat>();
for (int i = 1; i <= 20; i++)
{
string imagePath = $"calibration_images/{i}.jpg";
Mat image = Cv2.ImRead(imagePath, ImreadModes.Color);
calibrationImages.Add(image);
}
// 检测角点
List<List<Point2f>> imagePoints = new List<List<Point2f>>();
foreach (var image in calibrationImages)
{
Mat gray = new Mat();
Cv2.CvtColor(image, gray, ColorConversionCodes.BGR2GRAY);
List<Point2f> corners = new List<Point2f>();
bool found = Cv2.FindChessboardCorners(gray, boardSize, corners);
if (found)
{
Cv2.CornerSubPix(gray, corners, new Size(11, 11), new Size(-1, -1), new TermCriteria(CriteriaType.Eps | CriteriaType.MaxIter, 30, 0.1));
imagePoints.Add(corners);
Cv2.DrawChessboardCorners(image, boardSize, corners, found);
Cv2.ImShow("Chessboard," image);
Cv2.WaitKey(500);
}
}
// 进行相机标定
Mat cameraMatrix = new Mat();
Mat distCoeffs = new Mat();
List<Mat> rvecs = new List<Mat>();
List<Mat> tvecs = new List<Mat>();
Cv2.CalibrateCamera(objectPoints, imagePoints, calibrationImages[0].Size(), cameraMatrix, distCoeffs, rvecs, tvecs);
// 保存相机参数
cameraMatrix.Save("camera_matrix.xml");
distCoeffs.Save("dist_coeffs.xml");
Console.WriteLine("Camera calibration completed.");
Console.ReadKey();
}
}
}
上述代码中,我们首先设置了标定板的尺寸,然后创建了标定板上角点的三维坐标。接下来,我们读取了标定图像,并使用FindChessboardCorners函数检测角点。如果检测到了角点,我们使用CornerSubPix函数对角点进行亚像素级别的精确化处理,并绘制角点在图像上的位置。然后,我们使用CalibrateCamera函数进行相机标定,得到相机的内参和畸变参数。最后,我们将相机参数保存到文件中。 |
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