Add step2

step2

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <time.h>
+
+#define IDX(n)((n)%3)
+
+float inputImage[5][5] = {
+	{1,2,3,4,5},
+	{6,7,8,9,10},
+	{11,12,13,14,15},
+	{16,17,18,19,20},
+	{21,22,23,24,25}
+};
+
+float kx[3] = { 1.0f / 4,2.0f / 4,1.0f / 4 };
+float ky[3] = { 1.0f / 4,2.0f / 4,1.0f / 4 };
+float buf[3][3] = { 0 };
+
+void applySeparableGaussianBlur(float src[][5], float dst[][5], int h, int w, float kx[], float ky[3]) {
+	for (int i = 0; i < 2; ++i) {
+		for (int j = 1; j < w - 1; ++j) {
+			buf[i][j] = src[i][j - 1] * kx[0] + src[i][j] * kx[1] + src[i][j + 1] * kx[2];
+		}
+	}
+
+	for (int i = 1; i < h - 1; ++i) {
+		for (int j = 1; j < w - 1; ++j) {
+			buf[IDX(i + 1)][j] = src[i + 1][j - 1] * kx[0] + src[i + 1][j] * kx[1] + src[i + 1][j + 1] * kx[2];
+		}
+
+		for (int j = 1; j < w - 1; ++j) {
+			dst[i][j] = buf[IDX(i - 1)][j] * ky[0] + buf[IDX(i)][j] * ky[1] + buf[IDX(i + 1)][j] * ky[2];
+		}
+	}
+}
+
+int main() {
+	float outputImage[5][5] = { 0 };
+	clock_t start, end;
+	start = clock();
+	applySeparableGaussianBlur(inputImage, outputImage, 5, 5, kx, ky);
+	end = clock();
+	double timeSpent = (double)(end - start) / CLOCKS_PER_SEC;
+	for (int i = 0; i < 5; i++) {
+		for (int j = 0; j < 5; j++) {
+			printf("%-4.1f ", outputImage[i][j]);
+		}
+		printf("\n");
+	}
+	printf("The timeSpent is %1.32f second\n", timeSpent);
+}