#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
 
int main(int* argc, char** argv)
{
 FILE* fp = fopen("./threshold.bmp", "rb");
 if (fp == 0)
  return 0;
 BITMAPFILEHEADER fileHead;
 fread(&fileHead, sizeof(BITMAPFILEHEADER), 1, fp);
 
 BITMAPINFOHEADER infoHead;
 fread(&infoHead, sizeof(BITMAPINFOHEADER), 1, fp);
 int width = infoHead.biWidth;
 int height = infoHead.biHeight;
 int biCount = infoHead.biBitCount;
 
 int lineByte = (biCount*width / 8 + 3) / 4 * 4;
 RGBQUAD* pColorTable;
 pColorTable = new RGBQUAD[256];
 fread(pColorTable, sizeof(RGBQUAD), 256, fp);
 
 unsigned char* pBmpBuf;
 pBmpBuf = new unsigned char[lineByte*height];
 fread(pBmpBuf, lineByte*height, 1, fp);
 fclose(fp);
 
 // 新圖
 FILE* fop = fopen("close.bmp", "wb");
 if (fop == 0)
  return 0;
 
 // 膨脹操作
 // 初始化
 int t = 0, d = 0, r = 0;
 unsigned char* pBmpBuf2;
 pBmpBuf2 = new unsigned char[lineByte*height];
 for (int i = 0; i < height; ++i){
  for (int j = 0; j < width; ++j){
   *(pBmpBuf2 + i*lineByte + j) = 255;
  }
 }
 
 for (int i = 1; i < height; ++i){
  for (int j = 0; j < width - 1; ++j){
   t = *(pBmpBuf + i*lineByte + j);       // 當(dāng)前點(diǎn)
   d = *(pBmpBuf + (i - 1)*lineByte + j); // 下面點(diǎn)
   r = *(pBmpBuf + i*lineByte + j + 1);   // 右邊點(diǎn)
   if (t == 0 && d == 0 && r == 0){
    *(pBmpBuf2 + i*lineByte + j) = 0;       // 當(dāng)前點(diǎn)
   }
  }
 }
 // 結(jié)構(gòu)元素向上反轉(zhuǎn)180度，對(duì)最下面一排處理
 for (int j = 0; j < width - 1; ++j){
  t = *(pBmpBuf + j);            // 當(dāng)前點(diǎn)
  d = *(pBmpBuf + lineByte + j); // 上面點(diǎn)
  r = *(pBmpBuf + j + 1);        // 右邊點(diǎn)
  if (t == 0 && d == 0 && r == 0){
   *(pBmpBuf2 + j) = 0;       // 當(dāng)前點(diǎn)
  }
 }
 // 結(jié)構(gòu)元素向右反轉(zhuǎn)，對(duì)最右邊一列處理
 for (int i = 1; i < height; ++i){
  t = *(pBmpBuf + i*lineByte + width - 1);
  d = *(pBmpBuf + (i - 1)*lineByte + width - 1);
  r = *(pBmpBuf + i*lineByte + width - 2);
  if (t == 0 && d == 0 && r == 0){
   *(pBmpBuf2 + i*lineByte + width - 1) = 0;       // 當(dāng)前點(diǎn)
  }
 }
 
 // 腐蝕操作
 for (int i = 1; i < height; ++i){
  for (int j = 0; j < width - 1; ++j){
   t = *(pBmpBuf2 + i*lineByte + j);       // 當(dāng)前點(diǎn)
   d = *(pBmpBuf2 + (i - 1)*lineByte + j); // 下面點(diǎn)
   r = *(pBmpBuf2 + i*lineByte + j + 1);   // 右邊點(diǎn)
   if (t == 0 && d != 0){
    *(pBmpBuf2 + (i - 1)*lineByte + j) = 0;//下邊的置位1
   }
   if (t == 0 && r != 0){
    *(pBmpBuf2 + i*lineByte + j + 1) = 0;//右邊的置位1
    j = j + 1;
   }
  }
 }
 
 fwrite(&fileHead, sizeof(BITMAPFILEHEADER), 1, fop);
 fwrite(&infoHead, sizeof(BITMAPINFOHEADER), 1, fop);
 fwrite(pColorTable, sizeof(RGBQUAD), 255, fop);
 fwrite(pBmpBuf2, lineByte*height, 1, fop);
 fclose(fop);
 
 system("pause");
 return 0;
}