映像灰階化處理

//映像灰階化處理<br />void ImageGrayProcess(HBITMAP hBitmap, BOOL bAvgType=TRUE)<br />{<br /> if(hBitmap)<br /> {<br /> CBitmap *bmpSrc = CBitmap::FromHandle(hBitmap);</p><p> BITMAP bmSrcInfo;<br /> bmpSrc->GetBitmap( &bmSrcInfo );</p><p> DWORD dwBmByteSize = bmSrcInfo.bmWidthBytes * bmSrcInfo.bmHeight;<br /> LPBYTE pBmBits = (LPBYTE) GlobalAlloc(GPTR, dwBmByteSize);<br /> bmpSrc->GetBitmapBits(dwBmByteSize, pBmBits);</p><p> int nPixBytes = bmSrcInfo.bmBitsPixel/8;<br /> if(nPixBytes > 1)<br /> {<br /> int nRemainLineBytes = bmSrcInfo.bmWidthBytes - bmSrcInfo.bmWidth * nPixBytes; //每行剩餘位元組數<br /> DWORD dwOffset = 0;<br /> for(long nHeight=0; nHeight<bmSrcInfo.bmHeight; nHeight++)<br /> {<br /> for(long nWidth=0; nWidth<bmSrcInfo.bmWidth; nWidth++)<br /> {<br /> DWORD dwSum = 0;<br /> int Min = 0x7FFF, Max = 0;<br /> for(int np=0; np<nPixBytes; np++)<br /> {<br /> BYTE bCR = pBmBits[dwOffset + np];<br /> dwSum += bCR;<br /> if(Min > bCR) Min = bCR;<br /> if(Max < bCR) Max = bCR;<br /> }<br /> BYTE Gray = 0;<br /> if(bAvgType)<br /> Gray = (BYTE)(dwSum / nPixBytes); //均值<br /> else<br /> Gray = (BYTE)((Min + Max)/2); //中值</p><p> for(int np2=0; np2<nPixBytes; np2++)<br /> {<br /> pBmBits[dwOffset + np2] = Gray;<br /> }<br /> dwOffset += nPixBytes;<br /> }<br /> dwOffset += nRemainLineBytes;<br /> }<br /> }<br /> bmpSrc->SetBitmapBits(dwBmByteSize, pBmBits);<br /> GlobalFree(pBmBits);<br /> }<br />}