圖像的梯度銳化vc代碼

void CSDIELSView::OnSharpeningGradient()
  {
//程式編制：李立宗  
//2012-8-11
    if(myImage1.IsNull())
      OnOpenResourceFile();
    if(!myImage2.IsNull())
      myImage2.Destroy();
    if(myImage2.IsNull()){
      myImage2.Create(myImage1.GetWidth(),myImage1.GetHeight(),24,0);
    }
    //COLORREF pixel; 
    int maxY = myImage1.GetHeight();
    int maxX=myImage1.GetWidth();
    byte* pRealData;
    byte* pRealData2;
    pRealData=(byte*)myImage1.GetBits();
    pRealData2=(byte*)myImage2.GetBits();
    int pit=myImage1.GetPitch();
    int pit2=myImage2.GetPitch();
    //需要注意,pit和pit2的值并不一樣,是以如果使用一個值,會導緻不同的結果出現
    //CString str;
    //str.Format(TEXT("%d"),pit);
    //MessageBox(str);
    //str.Format(TEXT("%d"),pit2);
    //MessageBox(str);
    int bitCount=myImage1.GetBPP()/8;
    int bitCount2=myImage2.GetBPP()/8;
    int tempR,tempG,tempB;
    int temp,tempX,tempY;
    //int M[3][3]={{1,2,1},{2,4,2},{1,2,1}};
    int t=100; //門限
    //  tempR=tempG=tempG=0;
    //說明：将生産的圖像作為24位圖處理。
    for (int y=1; y<maxY-1; y++) {
      for (int x=1; x<maxX-1; x++) {
        temp=(int)sqrt((float)(
          (*(pRealData+pit*(y)+(x)*bitCount)-*(pRealData+pit*(y)+(x-1)*bitCount))*
          (*(pRealData+pit*(y)+(x)*bitCount)-*(pRealData+pit*(y)+(x-1)*bitCount))+
          (*(pRealData+pit*(y)+(x)*bitCount)-*(pRealData+pit*(y-1)+(x)*bitCount))*
          (*(pRealData+pit*(y)+(x)*bitCount)-*(pRealData+pit*(y-1)+(x)*bitCount))));
        if(temp>=t)
        {
          if(temp+100>255)
            tempR=255;
          else
            tempR=temp+100;
        }
        else
          tempR=*(pRealData+pit*(y)+(x)*bitCount);
        if(bitCount==1)
        {
          tempG=tempR;
          tempB=tempR;
        }
        else
        {
          temp=(int)sqrt((float)(
            (*(pRealData+pit*(y)+(x)*bitCount+1)-*(pRealData+pit*(y)+(x-1)*bitCount+1))*
            (*(pRealData+pit*(y)+(x)*bitCount+1)-*(pRealData+pit*(y)+(x-1)*bitCount+1))+
            (*(pRealData+pit*(y)+(x)*bitCount+1)-*(pRealData+pit*(y-1)+(x)*bitCount+1))*
            (*(pRealData+pit*(y)+(x)*bitCount+1)-*(pRealData+pit*(y-1)+(x)*bitCount+1))));
          if(temp>=t)
          {
            if(temp+100>255)
              tempG=255;
            else
              tempG=temp+100;
          }
          else
            tempG=*(pRealData+pit*(y)+(x)*bitCount+1);
          temp=(int)sqrt((float)(
            (*(pRealData+pit*(y)+(x)*bitCount+2)-*(pRealData+pit*(y)+(x-1)*bitCount+2))*
            (*(pRealData+pit*(y)+(x)*bitCount+2)-*(pRealData+pit*(y)+(x-1)*bitCount+2))+
            (*(pRealData+pit*(y)+(x)*bitCount+2)-*(pRealData+pit*(y-1)+(x)*bitCount+2))*
            (*(pRealData+pit*(y)+(x)*bitCount+2)-*(pRealData+pit*(y-1)+(x)*bitCount+2))));
          if(temp>=t)
          {
            if(temp+100>255)
              tempB=255;
            else
              tempB=temp+100;
          }
          else
            tempB=*(pRealData+pit*(y)+(x)*bitCount+2);
        }

        *(pRealData2+pit2*y+x*bitCount2)=tempR;
        *(pRealData2+pit2*y+x*bitCount2+1)=tempG;
        *(pRealData2+pit2*y+x*bitCount2+2)=tempB;
      }
    }
    Invalidate();
  }