【关键词】  快速傅里叶变换

    Technology for motional/motionless object recognition in noncontact lifeparameter detecting system

　　【Abstract】 AIM: To offer more object information to the rescue team by recognizing the motional/motionless state of an object in the detecting range of a noncontact lifeparameter detecting system. METHODS:  After extracting the respiration signals and the body signals, we compared the frequency domain energy of the signals with the threshold by a method based on Fast Fourier Transform (FFT). RESULTS:  In human detecting experiment of 20 cm and 30 cm thick wall, the motional/motionless state of an object was found to be well related to the energy ratio between the respiration signals and body signals within the detecting range of the system. CONCLUSION:  This method can be used by noncontact lifeparameter detecting system in different detecting conditions and can rapidly recognize the motional/motionless state of an object, thus enhancing the function of the system.

　　【Keywords】 object recognition; fast fourier transform; energy ratio; threshold; Delphi

　　【摘要】 目的： 识别非接触生命参数检测系统探测范围内目标的运动/静止状态，为探测人员提供更加丰富的目标信息. 方法 ：提取系统检测到的呼吸路信号和体动路信号，选取最优的数据长度分别进行快速傅里叶变换（FFT），对变换后两路信号的频域能量 分析 比较，参照设定的阈值进行识别. 结果：20 cm和30 cm穿墙探人实验表明，在系统的探测范围内，目标的运动/静止壮态与呼吸路信号和体动路信号的频域能量比有着良……