Because infrared sensor is easily affected by atmosphere hot radiation, long distance and sensor noise, the detected targets in infrared images often present like dim targets, even like point targets, and drowned in noise.

• 红外传感器受到大气热辐射和作用距离远以及探测器噪声等因素的影响,用其探测到的目标在红外图像上多呈现为对比度低的弱小目标,甚至为点目标,并且淹没在噪声中。