The tracking performance of traditional optic-electric tracking systems degenerates significantly when there is a drop of detection probability with intermittent observation.
随着不完全量测条件下探测概率的下降，传统光电跟踪系统的跟踪性能显著降低。
Ithaca, NY. Detection of low flow or a considerable drop in flow prompted angiography and PTA.
检测发现低流速或者流速降低迅速的患者进行血管造影和经皮穿刺血管成形术。
The method can effectively avoid the problems of undeteeting and false drop, and it uses the dual-threshold method to improve the detection efficiency.
灰度直方图算法有效避免了直方图法的漏检问题和灰度图法的误检问题，同时采用双阈值法提高了检测效率。
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