c语言实现模板匹配SSDA算法

以下是C语言实现模板匹配SSDA算法的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define WIDTH 640
#define HEIGHT 480

// 计算两个像素点之间的欧几里得距离
double euclidean_distance(unsigned char *image, int x1, int y1, int x2, int y2) {
    double sum = 0;
    for (int i = 0; i < 3; i++) {
        double diff = image[(y1 * WIDTH + x1) * 3 + i] - image[(y2 * WIDTH + x2) * 3 + i];
        sum += diff * diff;
    }
    return sqrt(sum);
}

// 计算两个像素点之间的相似度
double similarity(unsigned char *image, int x1, int y1, int x2, int y2) {
    double distance = euclidean_distance(image, x1, y1, x2, y2);
    return exp(-distance);
}

// 计算两个图像之间的相似度
double ssda(unsigned char *image1, unsigned char *image2, int x, int y, int w, int h) {
    double sum = 0;
    for (int i = 0; i < w; i++) {
        for (int j = 0; j < h; j++) {
            double sim = similarity(image1, x + i, y + j, i, j);
            sum += sim;
        }
    }
    return sum;
}

int main() {
    unsigned char *image = (unsigned char *)malloc(WIDTH * HEIGHT * 3);
    unsigned char *template = (unsigned char *)malloc(100 * 100 * 3);
    // 读取图像和模板
    // ...

    double max_similarity = 0;
    int max_x = 0, max_y = 0;
    for (int x = 0; x < WIDTH - 100; x++) {
        for (int y = 0; y < HEIGHT - 100; y++) {
            double sim = ssda(image, template, x, y, 100, 100);
            if (sim > max_similarity) {
                max_similarity = sim;
                max_x = x;
                max_y = y;
            }
        }
    }

    printf("Max similarity: %f\n", max_similarity);
    printf("Position: (%d, %d)\n", max_x, max_y);

    free(image);
    free(template);
    return 0;
}