In this code we check whether the ISBNs differ. If so, we discontinue execution and transfer control to a handler that will know how to handle this error.

这段代码检查IS BN对象是否不相同。如果不同的话，停止程序的执行，并将控制转移给处理这种错误的处理代码。

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When initial control point pair is obtained, variance check and error check were used to exclude fake control point pairs to get the final ones.

在得到初始控制点对后，以方差检验和误差检验来递归排除错误的控制点对，从而得到最终的控制点对。

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