Suanzi_2/blur_2.c

#include <stdio.h>  
#include <time.h>  

#define IDX(n) ((n) % 3)

float kx[3] = { 0.25, 0.5, 0.25 };
float ky[3] = { 0.25, 0.5, 0.25 };

void applySeparableGaussianBlur(float src[5][5], float dst[5][5], int h, int w, float kx[3], float ky[3]) {
    float buf[5][5] = { 0 };

    for (int i = 0; i < h; 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 = 0; j < w; j++) {
            dst[i][j] = buf[i - 1][j] * ky[0] + buf[i][j] * ky[1] + buf[i + 1][j] * ky[2];
        }
    }
}
int main() {
    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}
    };

    float dst[5][5] = { 0 };

    clock_t start = clock();
    applySeparableGaussianBlur(src, dst, 5, 5, kx, ky);
    clock_t end = clock();

    printf("模糊后的图像矩阵:\n");
    for (int i = 0; i < 5; i++) {
        for (int j = 0; j < 5; j++) {
            printf("%.2f ", dst[i][j]);
        }
        printf("\n");
    }

    double time_taken = (double)(end - start) / CLOCKS_PER_SEC;
    printf("运行时间: %e 秒\n", time_taken);

    return 0;
}