我想要在二值化图像中找到黑色的矩形，图像中可能有噪声，需要排除影响，请利用c语言写一份代码给我

以下是一份简单的 C 语言代码，可以在二值化图像中查找黑色矩形，并排除噪声影响：

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

#define WIDTH  640       // 图像宽度
#define HEIGHT 480       // 图像高度
#define THRESHOLD 128    // 二值化阈值
#define NOISE_SIZE 10    // 噪声最小尺寸

typedef struct {
    int x, y;   // 矩形左上角坐标
    int w, h;   // 矩形宽度和高度
} Rect;

int is_black(unsigned char *buf, int x, int y) {
    int offset = y * WIDTH + x;
    return buf[offset] < THRESHOLD;
}

int is_noise(unsigned char *buf, int x, int y) {
    int offset = y * WIDTH + x;
    int size = 0;
    for (int i = -1; i <= 1; i++) {
        for (int j = -1; j <= 1; j++) {
            if ((x + j >= 0) && (x + j < WIDTH) && (y + i >= 0) && (y + i < HEIGHT)) {
                if (is_black(buf, x+j, y+i)) {
                    size++;
                }
            }
        }
    }
    return size < NOISE_SIZE;
}

Rect find_rect(unsigned char *buf) {
    Rect rect = {0, 0, 0, 0};
    int max_area = 0;
    for (int y = 0; y < HEIGHT; y++) {
        for (int x = 0; x < WIDTH; x++) {
            if (is_black(buf, x, y) && is_noise(buf, x, y)) {
                int x1 = x;
                int x2 = x;
                while (is_black(buf, x1-1, y)) { x1--; }
                while (is_black(buf, x2+1, y)) { x2++; }
                int w = x2 - x1 + 1;
                int h = 1;
                while (is_black(buf, x, y+h)) {
                    int xc1 = x1;
                    int xc2 = x2;
                    int ok = 1;
                    while (xc1 <= xc2) {
                        if (!is_black(buf, xc1, y+h) || !is_black(buf, xc2, y+h)) {
                            ok = 0;
                            break;
                        }
                        xc1++;
                        xc2--;
                    }
                    if (!ok) {
                        break;
                    }
                    h++;
                }
                int area = w * h;
                if (area > max_area) {
                    max_area = area;
                    rect.x = x1;
                    rect.y = y;
                    rect.w = w;
                    rect.h = h;
                }
            }
        }
    }
    return rect;
}

int main() {
    unsigned char *buf = (unsigned char*)malloc(WIDTH*HEIGHT);
    FILE *fp = fopen("image.bin", "rb");
    fread(buf, sizeof(unsigned char), WIDTH*HEIGHT, fp);
    fclose(fp);
    Rect rect = find_rect(buf);
    printf("Rect: (%d, %d) %dx%d\n", rect.x, rect.y, rect.w, rect.h);
    free(buf);
    return 0;
}

该代码将二值化图像存储在一个名为 "image.bin" 的文件中，然后对其进行处理。如果黑色矩形的最大面积小于指定尺寸（即噪声），则将其忽略。