Because of difficulties of dim target detection and identifying, and there are background clutters and noise interfering, the dim target is easy to be masked.

• 由于微弱目标本身就很难以检测和识别,再加上图像背景杂波以及噪声的干扰,很容易将微弱目标掩盖掉,所以在进行目标检测之前需要进行背景杂波估计与抑制,事实证明这样的过程是必要、可行的。