The background difference is important for segmenting mobile objects. But this method highly depends on background quality and easily regards moving shadows as objects.
背景差分法是一种重要的运动目标分割方法，但是其不仅对背景质量的要求较高，且易将运动阴影误检测为前景目标。
Under the condition of complicated background traffics, how to maintain the Quality of Services (QoS) of VoIP is a hotspot in recent research.
如何在网络流量背景复杂的情况下保证因特网电话的服务质量是当前的一个研究热点。
Sufficient personnel with necessary education, background, and experience should be in all departments to ensure that quality system activities are properly and adequately performed.
每个部门要有足够的，受过必要教育，有必要背景及经验的人员来确保质量体系活动正确和适当地执行。
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