天基红外系统对弹道导弹中段目标观测过程中,可能前后帧间图像出现背景较大差异、目标短暂丢失或目标帧间剧烈位移等情况。针对此,提出一种基于目标特征和星点不变矩的弹道导弹中段红外图像目标检测方法,将模式识别中的不变矩概念与目标特征相结合,通过三次分类提取出候选恒星和弹头目标。经仿真计算分析,该方法在连续帧间变化时具有稳定的弹头目标检测效果,而且当帧间出现背景突变和星象拉长时也有较好的检测效果。

Due to obvious difference of background, transient lost of target lose or intensive displacement of frames of target when infrared system in the sky observing targets in midcourse trajectory of ballistic missile. Therefore, with combination of moment invariant in pattern recognition and the target's characteristics, possible star and warhead target are selected through classifying three times. This method not only realizes steady detection of warhead among consecutive changing frames, but also guarantees the solidity of warhead target detecting algorithm as the background changes suddenly among frames and star images draw out.