请给出图像进行二值化，降噪，补洞的C++相关代码

以下是一种基于C语言的图像二值化、降噪和补洞的代码实现：

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

#define WIDTH 512
#define HEIGHT 512
#define THRESHOLD 128

// 二值化
void binarize(unsigned char* input, unsigned char* output) {
    for(int i = 0; i < WIDTH*HEIGHT; i++) {
        output[i] = (input[i] > THRESHOLD) ? 255 : 0;
    }
}

// 降噪（中值滤波）
void denoise(unsigned char* input, unsigned char* output) {
    for(int y = 1; y < HEIGHT-1; y++) {
        for(int x = 1; x < WIDTH-1; x++) {
            int sum = 0;
            for(int dy = -1; dy <= 1; dy++) {
                for(int dx = -1; dx <= 1; dx++) {
                    sum += input[(y+dy)*WIDTH+(x+dx)];
                }
            }
            output[y*WIDTH+x] = sum/9;
        }
    }
}

// 补洞（基于拉普拉斯算子的边缘检测）
void fill_holes(unsigned char* input, unsigned char* output) {
    int laplacian[9] = {-1,-1,-1,-1,8,-1,-1,-1,-1};
    for(int y = 1; y < HEIGHT-1; y++) {
        for(int x = 1; x < WIDTH-1; x++) {
            int sum = 0;
            for(int dy = -1; dy <= 1; dy++) {
                for(int dx = -1; dx <= 1; dx++) {
                    sum += input[(y+dy)*WIDTH+(x+dx)] * laplacian[(dy+1)*3+(dx+1)];
                }
            }
            output[y*WIDTH+x] = (sum > 0) ? 255 : 0;
        }
    }
}

int main() {
    unsigned char* input = (unsigned char*)malloc(WIDTH*HEIGHT*sizeof(unsigned char));
    unsigned char* output = (unsigned char*)malloc(WIDTH*HEIGHT*sizeof(unsigned char));
    unsigned char* output2 = (unsigned char*)malloc(WIDTH*HEIGHT*sizeof(unsigned char));
    
    // 读取图像
    FILE* fp = fopen("input.jpg", "rb");
    fread(input, sizeof(unsigned char), WIDTH*HEIGHT, fp);
    fclose(fp);
    
    // 二值化
    binarize(input, output);
    
    // 降噪
    denoise(output, output2);
    
    // 补洞
    fill_holes(output2, output);
    
    // 写入图像
    fp = fopen("output.jpg", "wb");
    fwrite(output, sizeof(unsigned char), WIDTH*HEIGHT, fp);
    fclose(fp);
    
    free(input);
    free(output);
    free(output2);
    
    return 0;
}