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output/Libraries/AForge.Math/AForge/Math/Gaussian.cs

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+using System;
+
+namespace AForge.Math;
+
+public class Gaussian
+{
+	private double sigma = 1.0;
+
+	private double sqrSigma = 1.0;
+
+	public double Sigma
+	{
+		get
+		{
+			return sigma;
+		}
+		set
+		{
+			sigma = System.Math.Max(1E-08, value);
+			sqrSigma = sigma * sigma;
+		}
+	}
+
+	public Gaussian()
+	{
+	}
+
+	public Gaussian(double sigma)
+	{
+		Sigma = sigma;
+	}
+
+	public double Function(double x)
+	{
+		return System.Math.Exp(x * x / (-2.0 * sqrSigma)) / (System.Math.Sqrt(System.Math.PI * 2.0) * sigma);
+	}
+
+	public double Function2D(double x, double y)
+	{
+		return System.Math.Exp((x * x + y * y) / (-2.0 * sqrSigma)) / (System.Math.PI * 2.0 * sqrSigma);
+	}
+
+	public double[] Kernel(int size)
+	{
+		if (size % 2 == 0 || size < 3 || size > 101)
+		{
+			throw new ArgumentException("Wrong kernal size.");
+		}
+		int num = size / 2;
+		double[] array = new double[size];
+		int num2 = -num;
+		for (int i = 0; i < size; i++)
+		{
+			array[i] = Function(num2);
+			num2++;
+		}
+		return array;
+	}
+
+	public double[,] Kernel2D(int size)
+	{
+		if (size % 2 == 0 || size < 3 || size > 101)
+		{
+			throw new ArgumentException("Wrong kernal size.");
+		}
+		int num = size / 2;
+		double[,] array = new double[size, size];
+		int num2 = -num;
+		for (int i = 0; i < size; i++)
+		{
+			int num3 = -num;
+			for (int j = 0; j < size; j++)
+			{
+				array[i, j] = Function2D(num3, num2);
+				num3++;
+			}
+			num2++;
+		}
+		return array;
+	}
+}