| 摘要 |
A system and method are provided for automatically setting a thr eshold for a point level device without having a user select whether a point level element is covered or uncovered. A first and second value are measured from a point level element. Whether the point level element is covered or uncovered is determined based on whether the second measured value has increased or decreased with respect to the first measured value. A threshold value is determined based on at least one of the first and second measured values.
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