From 39fb1c83897f35bc2c969f8c4545c2257a4236c1 Mon Sep 17 00:00:00 2001
From: pmfsq5yrv <1159971203@qq.com>
Date: Fri, 6 Dec 2024 14:06:05 +0800
Subject: [PATCH] ADD file via upload

---
 yang/2.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 yang/2.c

diff --git a/yang/2.c b/yang/2.c
new file mode 100644
index 0000000..5cdb302
--- /dev/null
+++ b/yang/2.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <time.h>
+
+const int h = 5, w = 5;
+float kx[3] = {0.25f, 0.5f, 0.25f};
+float ky[3] = {0.25f, 0.5f, 0.25f};
+
+void separableGaussianBlur(float src[h][w], float dst[h][w], int h, int w, float kx[3], float ky[3]) {
+    float buf[3][w];  
+    int x, y;
+
+    #define BUF_INDEX(i) ((i) % 3)
+
+    for(y = 0; y < h; ++y){
+        for(x = 0; x < w; ++x){
+            buf[BUF_INDEX(y)][x] =
+                src[y][x] * kx[1] +
+                (x > 0 ? src[y][x - 1] * kx[0] : 0) +
+                (x < w - 1 ? src[y][x + 1] * kx[2] : 0);
+        }
+
+        if(y >= 2){
+            for(x = 1; x < w - 1; ++x){  
+                dst[y - 1][x] =
+                    buf[BUF_INDEX(y - 2)][x] * ky[0] +
+                    buf[BUF_INDEX(y - 1)][x] * ky[1] +
+                    buf[BUF_INDEX(y)][x] * ky[2];
+            }
+        }
+    }
+}
+
+int main() {
+    int i, j;
+    float dst[h][w];
+    for(i = 0; i < h; i++){
+        for (j = 0; j < w; j++){
+            dst[i][j] = 0.0;
+        }
+    }
+    float src[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}
+    };
+
+    clock_t start, end;
+    start = clock();
+    separableGaussianBlur(src, dst, h, w, kx, ky);
+    end = clock();
+
+    printf("Blurred result:\n");
+    for(i = 0; i < h; i++){
+        for(j = 0; j < w; j++){
+            printf("%.2f ", dst[i][j]);
+        }
+        printf("\n");
+    }
+    printf("Time: %f s\n", (float)(end - start) / CLOCKS_PER_SEC);
+    return 0;
+}