Non-constant error variance or heteroscedasticity.

非常量误差方差或异方差性。

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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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Since there is no need to suppose the variance of error, the estimation method which we established is more efficient in application.

由于在估计方法中无需假定误差方差，因此，所构造的估计方法更符合实际应用情况。

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