VC6.0图形处理9--轮廓提取

//前面请参照之前的文章

void CBMPViewerDoc::OnMenuitem32797() //轮廓提取 适合已经转变为二值图像

{

// TODO: Add your command handler code here

int linewidth;

linewidth=(pbi->bmiHeader.biWidth*pbi->bmiHeader.biBitCount+31)/32*4;

HLOCAL hTemp;

hTemp = LocalAlloc(LHND ,linewidth * bi.biHeight );

LPSTR lpTemp;

lpTemp = (char*)LocalLock(hTemp);

unsigned char *lpScr;

unsigned char * lpDest;

int sum;

// TODO: Add your command handler code here

for(int i = 0 ; i< bi.biHeight ; i++){

for(int j = 0 ; j< bi.biWidth ; j++){

lpDest = (unsigned char *)lpTemp + linewidth *(bi.biHeight - i -1) + j;

if((i == 0 ) || (j ==0) || (i == bi.biHeight) || (j == bi.biWidth) ){

lpScr = (unsigned char*)lpBuf + linewidth*(bi.biHeight - i -1) + j;

*lpDest = 255;

}

else{

sum = 0;

for(int m = i -1 ; m <= i+1 ;m++){

for(int n = j-1; n<=j+1; n++){

lpScr = (unsigned char*)lpBuf + linewidth*(bi.biHeight - m -1) + n;

sum += *lpScr;

}

}

if(sum %9 !=0 )

{

*lpDest = 0;

}

else *lpDest= 255;

}

}

}

memcpy(lpBuf, lpTemp, linewidth * bi.biHeight);

// Invalidata(TRUE);

UpdateAllViews(NULL,0,NULL);

}