为了检测出起伏背景下的弱小目标，需要对红外图像进行背景抑制。

In order to detect the weak targets from clutter background, the background suppression of IR image is necessary.

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原理分析与实验结果表明，这是一种易于硬件实现，能有效抑制强起伏背景杂波的线性滤波方法。

Theory analysis and computer simulation show the improved SMF is a linear approach and it can extract dim target from IR background clutter effectively.

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实验结果表明：对于含有目标信息的起伏背景图像，背景对消的最佳滤波方法，应采用开余滤波法。

Then, the experiment results show that in all of four filtering methods, the open residue filtering method is the best for background drop.

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