The result of test shows that the new method works well in real-time, restraining noise and background image, maintaining object image detail.

实验结果表明该方法实时性好，抑制了噪声和背景信息的同时保持了目标细节信息。

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Firstly, a background estimation method based on small window and two dimension median filter is presented after detail analysis of the model of small infrared target, noise and clutter.

首先分析了红外小目标、噪声及其杂波特性，提出了用小窗口的二维中值滤波进行背景估计；

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The acquisition performance of the system had been analyzed in detail with phase error of PN sequences, Doppler shift and background noise taken into consideration.

在综合考虑伪码相位误差，多普勒频移和噪声干扰的基础上，详细分析了系统的捕获性能。

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Just as grain size in silver halide film ultimately limits the amount of detail you can see in a photograph, the background noise produced by the sensor does much the same in digital imaging.

ECONOMIST: A die-hard analog photographer goes digital