Csharp 如何使用 Imagemagick.Net 判断模糊图像

我只是在谷歌上搜索了一下，然后在Stackoverflow/Blog上找到了一些答案:

public static class ImageExtensions
{
  // as seen here: https://pyimagesearch.com/2015/09/07/blur-detection-with-opencv/
  public static bool IsBlurry(this Image image, double threshold = 100.0)
  {
    var mat = GetMatFromSDImage(image);
    var varianceOfLaplacian = VarianceOfLaplacian(mat);
    return varianceOfLaplacian < threshold;
  }


  // as seen here: https://stackoverflow.com/questions/58005091/how-to-get-the-variance-of-laplacian-in-c-sharp
  private static double VarianceOfLaplacian(Mat mat)
  {
    using var laplacian = new Mat();
    CvInvoke.Laplacian(mat, laplacian, DepthType.Cv64F);
    var mean = new MCvScalar();
    var stddev = new MCvScalar();
    CvInvoke.MeanStdDev(laplacian, ref mean, ref stddev);
    return stddev.V0 * stddev.V0;
  }

  // as found here https://stackoverflow.com/questions/40384487/system-drawing-image-to-emgu-cv-mat
  private static Mat GetMatFromSDImage(Image image)
  {
    int stride = 0;
    Bitmap bmp = new Bitmap(image);

    System.Drawing.Rectangle rect = new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height);
    System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, bmp.PixelFormat);

    System.Drawing.Imaging.PixelFormat pf = bmp.PixelFormat;
    if (pf == System.Drawing.Imaging.PixelFormat.Format32bppArgb)
    {
      stride = bmp.Width * 4;
    }
    else
    {
      stride = bmp.Width * 3;
    }

    Image<Bgra, byte> cvImage = new Image<Bgra, byte>(bmp.Width, bmp.Height, stride, (IntPtr)bmpData.Scan0);

    bmp.UnlockBits(bmpData);

    return cvImage.Mat;
  }
}

我注意到了代码片段的来源，因为我在这里没有实现任何东西；)它确实需要Emgu.CV包不是imagemagick.

我希望这能有所帮助，它通过了几次测试，我只是做到了.