... background exposure 本底照射 background fluctuations 背景起伏，背景波动 background fog 本底雾 ...
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It was further explained that the background fluctuation limit was not the final limit of the detector sensitivity.
进一步说明背景光子噪声并不是探测器灵敏度的最后极限。
The optimum detector for passive detection is energy detector. Yet energy detector usually deteriorates due to fluctuation of background interference and a decrease in SNR.
被动信号检测的最佳检测器是能量检测器，但是能量检测器往往因为背景干扰的起伏和信噪比的劣化导致检测性能的下降。
The algorithm adopts low pass filter to estimate the background and calculates the standard deviation to estimate the fluctuation of background to get the local adaptive detection threshold.
该算法以低通滤波算法估计背景中的低频成分，及图像局部方差估计背景起伏，来计算出局部自适应的目标检测判决门限。
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