void __fastcall TForm1::Button4Click(TObject *Sender)
{
  int low,up,down,left,right,col,row;
  Byte *ptr2, *tptr, *uptr, *dptr;

if(Image2->Picture->Bitmap->Empty)
  Image2->Picture->Bitmap=Image1->Picture->Bitmap;

  for (row=0; row<Image2->Picture->Height; row++)
       {
         up     =row-1;
                if(up<0)
                   up=Image2->Picture->Height -1;     //发现小于min(Height)，则取max(Height)来使用
         down   =row+1;
                if(down==Image2->Picture->Height)
                   down=0;                           //发现大于max(Height)，则取min(Height)来使用

         uptr = (Byte*) Image2->Picture->Bitmap->ScanLine[up];
         tptr = (Byte*) Image2->Picture->Bitmap->ScanLine[row];
         dptr = (Byte*) Image2->Picture->Bitmap->ScanLine[down];

         for (col=0; col<Image2->Picture->Width; col++)
             {
                left    =col-1;
                    if(left<0)
                        left=Image2->Picture->Width -1;//发现小于min(width)，则取max(width)来使用
                right   =col+1;
                    if(right==Image2->Picture->Width)
                        right=0;                      //发现大于max(width)，则取min(width)来使用

                low = (int)(uptr[left] +uptr[col] +uptr[right]+
                            tptr[left] +tptr[col] +tptr[right]+
                            dptr[left] +dptr[col] +dptr[right] );

                low=low/9;
                tptr[col]= (Byte)(low);
              }
       }
       //ShowMessage(col);
       Repaint();
}