图像中值滤波代码

void MedianFilter(IMG_DATATYPE *pImg,int iWidth,int iHeight,int size)
{
    IMG_DATATYPE *pSrc = NULL;
    IMG_DATATYPE *pBuff = NULL;
    int i,j,x,y,iRealSize;
    IMG_DATATYPE temp;

    pSrc = new IMG_DATATYPE[iWidth * iHeight];
    pBuff = new IMG_DATATYPE[size * size];
    if(pImg == NULL || pSrc == NULL || pBuff == NULL || iWidth <= 0 || iHeight <= 0)
        return;

    for(i=0;i<iHeight;i++)
    {
        for(j=0;j<iWidth;j++)
        {
            iRealSize = 0;
            for(x = -size/2;x <= size/2;x++)
                for(y = -size/2;y <= size/2;y++)
                {
                    if(i + x >= 0 && i + x < iHeight && j + y >= 0 && j + y < iWidth)
                    {
                        pBuff[iRealSize++] = pImg[(i + x) * iWidth + (j + y)];
                    }
                }
            
            for(x = 0;x < iRealSize - 1;x++)
                for(y = 0;y < iRealSize - 1 - x;y++)
                {
                    if(pBuff[y] > pBuff[y+1])
                    {
                        temp = pBuff[y];
                        pBuff[y] = pBuff[y+1];
                        pBuff[y+1] = temp;
                    }
                }

            pSrc[i * iWidth + j] = pBuff[iRealSize/2];
        }
    }

    memcpy(pImg, pSrc, iWidth * iHeight);

    delete pSrc;
    delete pBuff;
}