Added: Create Gaussian filter

ameycodes · abranhe · commit c99ee6b1bb3e · 2020-10-08T09:00:27.000-04:00
diff --git a/algorithms/image-processing/createGaussianFilter.cpp b/algorithms/image-processing/createGaussianFilter.cpp
@@ -0,0 +1,43 @@
+// Generate Gaussian filter
+
+#include <cmath>
+#include <iomanip>
+#include <iostream>
+using namespace std;
+
+// Function to create Gaussian filter
+void FilterCreation(double GKernel[][5])
+{
+	// intialising standard deviation to 1.0
+	double sigma = 1.0;
+	double r, s = 2.0 * sigma * sigma;
+
+	// sum is for normalization
+	double sum = 0.0;
+
+	// generating 5x5 kernel
+	for (int x = -2; x <= 2; x++) {
+		for (int y = -2; y <= 2; y++) {
+			r = sqrt(x * x + y * y);
+			GKernel[x + 2][y + 2] = (exp(-(r * r) / s)) / (M_PI * s);
+			sum += GKernel[x + 2][y + 2];
+		}
+	}
+
+	// normalising the Kernel
+	for (int i = 0; i < 5; ++i)
+		for (int j = 0; j < 5; ++j)
+			GKernel[i][j] /= sum;
+}
+
+int main()
+{
+	double GKernel[5][5];
+	FilterCreation(GKernel);
+
+	for (int i = 0; i < 5; ++i) {
+		for (int j = 0; j < 5; ++j)
+			cout << GKernel[i][j] << "\t";
+		cout << endl;
+	}
+}
