With the world's sustaining care on security, Video Surveillance System is being a more and more important role in every layer of society as the safe guarding method.

随着世界对安全的不断关注，视频监控系统作为重要的安全防护手段越来越深入到社会生活的各个层面。

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Besides, in order to restrict the consumer risk of the verification result of one measuring instrument, the estimation method for reasonably setting the guarding-band is also discussed.

此外，为限制单台仪器检定结论的用户风险，还给出了合理设置保护带的近似计算方法。

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