#include<iostream>
#include<cmath>
#include<cstdio>

#define H 265
#define W 272

using namespace std;

int main()
{
    unsigned char *grey;
    grey = new unsigned char[H * W];
    FILE *f;
    fopen_s(&f, "./数据/blood.raw", "rb");
    if (f)
    {
        fread(grey, sizeof(unsigned char), H * W, f);
        fclose(f);
    }
    else
    {
        cout << "无法打开文件" << endl;
        return 0;
    }

    // 拉普拉斯模板
    int tw = 3;
    int th = 3;
    int template1[9]={0,1,0,1,-4,1,0,1,0};

    int i,j,k,l;    // 中间变量
    unsigned char *result;
    result = new unsigned char[H * W];

    for (i = 0; i < H * W; i++)
    {
        result[i] = 255;
    }
    for (i = th / 2; i < H - th / 2; i++)
    {
        for (j = tw / 2; j < W - tw / 2; j++)
        {
            // 应用拉普拉斯模板
            int sum = 0;
            for (k = -th / 2; k <= th / 2; k++)
            {
                for (l = -tw / 2; l <= tw / 2; l++)
                {
                    sum += grey[(i + k) * W + (j + l)] * template1[(k + th / 2) * tw + (l + tw / 2)];
                }
            }
            sum = abs(sum);
            if (sum < 1)
            {
                result[i * W + j] = 0;
            }
            else
            {
                result[i * W + j] = 255;
            }
        }
    }

    // 将结果写入文件
    FILE *fresult;
    fopen_s(&fresult, "./数据/laplacian.raw", "wb");
    if (fresult)
    {
        fwrite(result, sizeof(unsigned char), H * W, fresult);
        fclose(fresult);
    }
    else
    {
        cout << "创建文件失败" << endl;
        return 0;
    }

    return 0;
}