傅里叶描述子的c++实现代码?
时间: 2023-03-25 13:00:41 浏览: 80
傅里叶描述子是一种用于图像识别和匹配的特征提取方法,其C语言实现代码如下:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define PI 3.14159265358979323846
// 计算傅里叶描述子
void fourier_descriptor(double *x, double *y, int n, int k, double *a, double *b)
{
int i, j;
double sumx, sumy, theta;
for (i = ; i < k; i++) {
sumx = sumy = .;
theta = 2. * PI * i / n;
for (j = ; j < n; j++) {
sumx += x[j] * cos(j * theta) + y[j] * sin(j * theta);
sumy += y[j] * cos(j * theta) - x[j] * sin(j * theta);
}
a[i] = sumx / n;
b[i] = sumy / n;
}
}
// 主函数
int main()
{
int n, k, i;
double *x, *y, *a, *b;
// 读取数据
printf("请输入点的个数n和傅里叶描述子的个数k:");
scanf("%d%d", &n, &k);
x = (double *)malloc(n * sizeof(double));
y = (double *)malloc(n * sizeof(double));
a = (double *)malloc(k * sizeof(double));
b = (double *)malloc(k * sizeof(double));
printf("请输入点的坐标:\n");
for (i = ; i < n; i++) {
scanf("%lf%lf", &x[i], &y[i]);
}
// 计算傅里叶描述子
fourier_descriptor(x, y, n, k, a, b);
// 输出结果
printf("傅里叶描述子:\n");
for (i = ; i < k; i++) {
printf("a[%d] = %lf, b[%d] = %lf\n", i, a[i], i, b[i]);
}
// 释放内存
free(x);
free(y);
free(a);
free(b);
return ;
}