private static ComplexF[,] prepareKernel(float[,] kernel, Size paddedImageSize)
{
var preparedKernel = new ComplexF[paddedImageSize.Height, paddedImageSize.Width];
preparedKernel.ReplaceRe(kernel, new Rectangle(new Point(), kernel.Size()));
preparedKernel.FFT(FourierTransform.Direction.Forward, true);
return(preparedKernel);
}
