for (i=0;i<Height;i++)
    {
        TpPixelV = -1000;
        ptr = (uchar*) (pImg->imageData + i * pImg->widthStep);
        for (j=0;j<Width;j++)
        {
            Pixelv = (int)ptr[j];
            if (Pixelv>TpPixelV)
            {
                TpPixelV = Pixelv;
                MaxValueWith = j;
            }
        }
        for (TpX=MaxValueWith-3;TpX<=MaxValueWith+3;TpX++)
        {
            TpPixelV = (int)ptr[TpX];
            SumValue += TpPixelV;
            EveryValue += (TpX)*TpPixelV;
        }
        RealMiddle = (double)EveryValue/((double)SumValue+0.00001);
        TMaxValueWith = RealMiddle;
   
        ptr[TMaxValueWith] = 255;
    }

应该是对的

其实我没有明白意图。。。

你不将整个代码给我们看，哪知道对不对啊，尤其是for里面变量有没有声明

看不懂那些英语....