The general eddy current flaw reconstruction strategy was the least-square error method, which required the forward solver having high speed. 在涡流检测中，常利用最小方差法来进行缺陷重构，这种方法要求正问题的求解效率高。
The two common means for segmenting the fingerprint image are variance method and direction method, which utilize its gray characteristic and direction information, respectively. 摘要在研究和分析方差法和方向法的基础上，提出了一种指纹图像分割的新方法。
