|
|
#include <stdio.h>
|
|
|
#include <time.h>
|
|
|
|
|
|
// 应用3x3 GaussianBlur到给定的二维数组src上，并将结果存到二维数组dst中
|
|
|
void applyGaussianBlur(float src[][5], float dst[][5], int h, int w, float kernel[3][3]) {
|
|
|
int i, j; // 在函数开头声明循环变量，符合C89要求
|
|
|
for (i = 1; i < h - 1; ++i) {
|
|
|
for (j = 1; j < w - 1; ++j) {
|
|
|
dst[i][j] =
|
|
|
src[i - 1][j - 1] * kernel[0][0] + src[i - 1][j] * kernel[0][1] + src[i - 1][j + 1] * kernel[0][2] +
|
|
|
src[i][j - 1] * kernel[1][0] + src[i][j] * kernel[1][1] + src[i][j + 1] * kernel[1][2] +
|
|
|
src[i + 1][j - 1] * kernel[2][0] + src[i + 1][j] * kernel[2][1] + src[i + 1][j + 1] * kernel[2][2];
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
int main() {
|
|
|
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 kernel[3][3] = {
|
|
|
{1.0f / 16, 2.0f / 16, 1.0f / 16},
|
|
|
{2.0f / 16, 4.0f / 16, 2.0f / 16},
|
|
|
{1.0f / 16, 2.0f / 16, 1.0f / 16}
|
|
|
};
|
|
|
float outputImage[5][5];
|
|
|
int i, j; // 在函数开头声明循环变量，符合C89要求
|
|
|
|
|
|
// 计时开始
|
|
|
clock_t start_time = clock();
|
|
|
|
|
|
applyGaussianBlur(inputImage, outputImage, 5, 5, kernel);
|
|
|
|
|
|
// 计时结束
|
|
|
clock_t end_time = clock();
|
|
|
double elapsed_time = ((double)(end_time - start_time)) / CLOCKS_PER_SEC;
|
|
|
|
|
|
// 输出结果矩阵
|
|
|
printf("经过GaussianBlur后的图像矩阵：\n");
|
|
|
for (i = 0; i < 5; ++i) {
|
|
|
for (j = 0; j < 5; ++j) {
|
|
|
printf("%.2f ", outputImage[i][j]);
|
|
|
}
|
|
|
printf("\n");
|
|
|
}
|
|
|
|
|
|
// 输出运行时间
|
|
|
printf("运行时间：%.6f 秒\n", elapsed_time);
|
|
|
|
|
|
return 0;
|
|
|
} |
