#include
#include
#include

using?namespace?std;

FILE?*pPic=NULL;
BITMAPFILEHEADER?*pBitmapFileHeader;
BITMAPINFOHEADER?*pBitmapInfoHeader;
RGBQUAD?*pPalette?*pGrayPalette*pBinaryPalette;
int?linePixelgrayLinePixelbinaryLinePixel;//the?line?of?pixel?number
int?threshold=256/2;
unsigned?char?*pDIB*pGrayDIB*pBinaryDIB*pBigDIB;


void?openFileGetInfo（）
{
????char??picName[20]=“your.bmp“;
????pBitmapFileHeader=new?BITMAPFILEHEADER;
????pBitmapInfoHeader=new?BITMAPINFOHEADER;

????FILE?*pPic=fopen（picName“rb“）;
????if（pPic==0）
????{
????????cout<<“open?the?file?fail“<????????exit（0）;
????}
????/*void?getBITMAPFILEHEADER（）{}*/
????fread（pBitmapFileHeadersizeof（BITMAPFILEHEADER）1pPic）;
????if（pBitmapFileHeader->bfType!=0x4d42）
????{
????????cout<<“this?is?not?a?BMP?file\n“;
????????exit（0）;
????}

????/*void?getBITMAPINFOHEADER（）{}*/
????fread（pBitmapInfoHeadersizeof（BITMAPINFOHEADER）1pPic）;

????/*void?getPalette（）{}*/
???//?cout<<“用多少位表示顏色?=?“<biBitCount<????if（pBitmapInfoHeader->biBitCount<24）
????{
????????cout<<“this?is?not?color?picture?!?\n“;
????????pPalette=new?RGBQUAD[1<biBitCount];
????????fread（pPalettesizeof（RGBQUAD）1<biBitCountpPic）;
????}
????/*void?getDIB（FILE?*pic）{}*/
????linePixel=（（pBitmapInfoHeader->biWidth*pBitmapInfoHeader->biBitCount）/8+3）/4*4;
????pDIB=new?unsigned?char?[pBitmapInfoHeader->biHeight*linePixel];
????fread（pDIB1pBitmapInfoHeader->biHeight*linePixelpPic）;

????fclose（pPic）;
}

void?modifyFileHeader（）
{
????pBitmapInfoHeader->biBitCount=8;
????pBitmapInfoHeader->biClrUsed=0;

????pBitmapFileHeader->bfOffBits=sizeof（BITMAPFILEHEADER）+sizeof（BITMAPINFOHEADER）+sizeof（RGBQUAD）*256;
????grayLinePixel=?（（pBitmapInfoHeader->biWidth*pBitmapInfoHeader->biBitCount）/8+3）/4*4;
????pBitmapInfoHeader->biSizeImage=grayLinePixel*pBitmapInfoHeader->biHeight;
????pBitmapFileHeader->bfSize=pBitmapFileHeader->bfOffBits+?pBitmapInfoHeader->biSizeImage;

}
void?createPalette（）
{
????int?i=255;
????pGrayPalette=new?RGBQUAD[i+1];
????while（i>=0）
????{

????????pGrayPalette[i].rgbBlue=（byte）i;
????????pGrayPalette[i].rgbRed=（byte）i;
????????pGrayPalette[i].rgbGreen=（byte）i;
????????i--;
????}
}
void?modifyDIB（）
{
????int?ij=0temp=0;
????int?countWidth=0;
????int?biWidth=pBitmapInfoHeader->biWidth;
????int?gapGray=grayLinePixel-biWidth;
????int?gapColour=linePixel-biWidth*3;
????pGrayDIB=new?unsigned?char?[grayLinePixel*pBitmapInfoHeader->biHeight];
????for（i=0;?ibiHeight;?i++）
????{
????????if（countWidth==biWidth）
????????{
????????????countWidth=0;
????????????j+=gapColour;
????????????for（temp=0;?temp????????????{
????????????????pGrayDIB[i]=pGrayDIB[i-1];
????????????????i++;
????????????}
????????????i--;
????????????continue;
????????}
????????countWidth++;

??