由于背景边缘及强噪声的存在, 红外弱小目标容易被覆盖, 弱小目标的检测一直是红外图像处理的难点。在分析红外图像模型的基础上, 引入最大中值滤波, 在不影响边缘锐度的条件下, 较好地抑制孤立噪声点, 有效提高信噪比, 然后采用基于方差的K均值聚类算法最终检测出弱小目标。实验结果表明, 与传统滤波算法及形态学算法相比, 该算法计算简单, 能有效检测出弱小目标。

The dim and small infrared targets are easily covered for the background edge and strong noise, and the dim and small target detection is always the difficulties of infrared image processing. Based on analyzing the infrared image model, max-median filter algorithm is introduced to inhibit isolated noise point and improve signal to noise rate (SNR) under the condition of no influence on edge sharpness. And the dim and small target is detected at last using variance K-means clustering algorithm. Experimental results show that comparing with traditional filtering and morphologic algorithms, the algorithm has simple calculation, which can effectively get the dim and small target．