如何写一个主函数去调用这个，求指导

bool imageSubtract(IplImage* src, IplImage* dst)
{
int row = 0;//行
int col = 0;//列
uchar* pSrcData = NULL;
uchar* pDstData = NULL;
int stepSrc = 0;
int stepDst = 0;

if (!src || !dst)
{
    return 0;
}
if ((src->height != dst->height) && (src->width != dst->width))
{
    return 0;
}

pSrcData = (uchar *)src->imageData;
stepSrc = src->widthStep / sizeof(uchar);

pDstData = (uchar *)src->imageData;
stepDst = dst->widthStep / sizeof(uchar);

for (row = 0;row <src->height;row++)
{
    for (col = 0;col<src->width;col++)
    {
        pDstData[row*stepDst + col] = abs(pSrcData[row*stepSrc + col] - pDstData[row*stepDst + col]);
    }
}
return 1;

}

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