写一个C语言，拉普拉斯算子锐化图像的代码

以下是拉普拉斯算子锐化图像的C语言代码：

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

#define WIDTH 512
#define HEIGHT 512

int main()
{
    FILE *fp_in, *fp_out;
    unsigned char image[HEIGHT][WIDTH];
    unsigned char new_image[HEIGHT][WIDTH];
    int i, j, k, l;
    int mask[3][3] = {{-1, -1, -1}, {-1, 8, -1}, {-1, -1, -1}};

    fp_in = fopen("lena512.raw", "rb");
    if (!fp_in) {
        printf("Cannot open file.\n");
        exit(1);
    }
    fread(image, sizeof(unsigned char), WIDTH * HEIGHT, fp_in);
    fclose(fp_in);

    for (i = 1; i < HEIGHT - 1; i++) {
        for (j = 1; j < WIDTH - 1; j++) {
            int sum = 0;
            for (k = -1; k <= 1; k++) {
                for (l = -1; l <= 1; l++) {
                    sum += image[i + k][j + l] * mask[k + 1][l + 1];
                }
            }
            if (sum < 0) {
                sum = 0;
            } else if (sum > 255) {
                sum = 255;
            }
            new_image[i][j] = (unsigned char)sum;
        }
    }

    fp_out = fopen("lena512_laplacian.raw", "wb");
    if (!fp_out) {
        printf("Cannot open file.\n");
        exit(1);
    }
    fwrite(new_image, sizeof(unsigned char), WIDTH * HEIGHT, fp_out);
    fclose(fp_out);

    return 0;
}

这个程序读取名为"lena512.raw"的灰度图像文件，然后对其进行拉普拉斯算子锐化处理，并将结果保存为"lena512_laplacian.raw"文件。