//定義拉普拉斯高斯算子
float Template_Log[25]={-2.0f,-4.0f,-4.0f,-4.0f,-2.0f,
-4.0f,0.0f,8.0f,0.0f,-4.0f,
-4.0f,8.0f,24.0f,8.0f,-4.0f,
-4.0f,0.0f,8.0f,0.0f,-4.0f,
-2.0f,-4.0f,-4.0f,-4.0f,-2.0f
};
//參數(shù)說明：
//hWnd 圖像處理的窗口句柄
//函數(shù)說明： 函數(shù)實(shí)現(xiàn)圖像的拉普拉斯高斯邊緣檢測

BOOL LapOfGauss(HWND hWnd)
{	
	//定義偏移，內(nèi)存
	DWORD              OffBits,BufSize;
	//文件信息頭指針
	LPBITMAPINFOHEADER lpImgData;
	//數(shù)據(jù)區(qū)指針
	LPSTR              lpPtr;
	HLOCAL             hTempImgData;
	LPBITMAPINFOHEADER lpTempImgData;
	LPSTR              lpTempPtr;
	//定義了一個(gè)DC
	HDC                hDc;
	//文件句柄
	HFILE              hf;
	LONG               x,y;
	float              coef;
	float              TempNum;
	
	coef=(float)(1.0);
	//得到數(shù)據(jù)相對文件頭的偏移
	OffBits=bf.bfOffBits-sizeof(BITMAPFILEHEADER);
	//計(jì)算所需內(nèi)存
	BufSize=bf.bfSize-sizeof(BITMAPFILEHEADER);
	//分配內(nèi)存
	if((hTempImgData=LocalAlloc(LHND,BufSize))==NULL)
	{
		MessageBox(hWnd,"Error alloc memory!","Error Message",MB_OK|MB_ICONEXCLAMATION);
		return FALSE;
	}
	//鎖定內(nèi)存區(qū)域
	lpImgData=(LPBITMAPINFOHEADER)GlobalLock(hImgData);    
	lpTempImgData=(LPBITMAPINFOHEADER)LocalLock(hTempImgData);
	//指向數(shù)據(jù)區(qū)
	lpPtr=(char *)lpImgData;
	lpTempPtr=(char *)lpTempImgData;
	//數(shù)據(jù)復(fù)制
	memcpy(lpTempPtr,lpPtr,BufSize);
	//拉普拉斯高斯邊緣檢測
	for(y=2;y<bi.biHeight-2;y++)
		for(x=2;x<bi.biWidth-2;x++){
			//得到數(shù)據(jù)區(qū)位置
			lpPtr=(char *)lpImgData+(BufSize-LineBytes-y*LineBytes)+x;
			lpTempPtr=(char *)lpTempImgData+(BufSize-LineBytes-y*LineBytes)+x;
			//與算子進(jìn)行加權(quán)運(yùn)算
			TempNum=(float)((unsigned char)*(lpPtr+2*LineBytes-2))*Template_Log[0];
			TempNum+=(float)((unsigned char)*(lpPtr+2*LineBytes-1))*Template_Log[1];
			TempNum+=(float)((unsigned char)*(lpPtr+2*LineBytes))*Template_Log[2];
			TempNum+=(float)((unsigned char)*(lpPtr+2*LineBytes+1))*Template_Log[3];
			TempNum+=(float)((unsigned char)*(lpPtr+2*LineBytes+2))*Template_Log[4];
			TempNum+=(float)((unsigned char)*(lpPtr+LineBytes-2))*Template_Log[5];
			TempNum+=(float)((unsigned char)*(lpPtr+LineBytes-1))*Template_Log[6];
			TempNum+=(float)((unsigned char)*(lpPtr+LineBytes))*Template_Log[7];
			TempNum+=(float)((unsigned char)*(lpPtr+LineBytes+1))*Template_Log[8];
			TempNum+=(float)((unsigned char)*(lpPtr+LineBytes+2))*Template_Log[9];
			
			TempNum+=(float)((unsigned char)*(lpPtr-2))*Template_Log[10];
			TempNum+=(float)((unsigned char)*(lpPtr-1))*Template_Log[11];
			TempNum+=(float)((unsigned char)*(lpPtr))*Template_Log[12];
			TempNum+=(float)((unsigned char)*(lpPtr+1))*Template_Log[13];
			TempNum+=(float)((unsigned char)*(lpPtr+2))*Template_Log[14];
			TempNum+=(float)((unsigned char)*(lpPtr-LineBytes-2))*Template_Log[15];
			TempNum+=(float)((unsigned char)*(lpPtr-LineBytes-1))*Template_Log[16];
			TempNum+=(float)((unsigned char)*(lpPtr-LineBytes))*Template_Log[17];
			TempNum+=(float)((unsigned char)*(lpPtr-LineBytes+1))*Template_Log[18];
			TempNum+=(float)((unsigned char)*(lpPtr-LineBytes+2))*Template_Log[19];
			TempNum+=(float)((unsigned char)*(lpPtr-2*LineBytes-2))*Template_Log[20];
			TempNum+=(float)((unsigned char)*(lpPtr-2*LineBytes-1))*Template_Log[21];
			TempNum+=(float)((unsigned char)*(lpPtr-2*LineBytes))*Template_Log[22];
			TempNum+=(float)((unsigned char)*(lpPtr-2*LineBytes+1))*Template_Log[23];
			TempNum+=(float)((unsigned char)*(lpPtr-2*LineBytes+2))*Template_Log[24];
			//乘上系數(shù)
			TempNum*=coef;
			//臨界判斷
			if(TempNum>255.0) *lpTempPtr=(BYTE)255;
			else if(TempNum<0.0) 
				*lpTempPtr=(unsigned char)fabs(TempNum);
			else *lpTempPtr=(BYTE)TempNum;
		}
		//得到窗口的DC
		hDc=GetDC(hWnd);
		if(hBitmap!=NULL)
			DeleteObject(hBitmap);
		//創(chuàng)建位圖
		hBitmap=CreateDIBitmap(hDc,	(LPBITMAPINFOHEADER)lpTempImgData, (LONG)CBM_INIT,
			(LPSTR)lpTempImgData+sizeof(BITMAPINFOHEADER) +NumColors*sizeof(RGBQUAD),
			(LPBITMAPINFO)lpTempImgData, DIB_RGB_COLORS);
		//保存位圖
		hf=_lcreat("c:\\log.bmp",0);
		_lwrite(hf,(LPSTR)&bf,sizeof(BITMAPFILEHEADER)); 
		_lwrite(hf,(LPSTR)lpTempImgData,BufSize);
		_lclose(hf);
		//釋放資源
		ReleaseDC(hWnd,hDc);
		LocalUnlock(hTempImgData);
		LocalFree(hTempImgData);
		GlobalUnlock(hImgData);
		return TRUE;
}