[2] [2] YANG C C,MA J Y,QI S X,et al.Directional support value of Gaussian transformation for infrared small target detection［J］.Applied Optics,2015,54(9):2255-2265.

[4] [4] ZAVERI M A,MERCHANT S N,DESAI U B.Air-borne approaching target detection and tracking in infrared image sequence［C］//International Conference on Image Processing,2004,2(10):1025-1028.

[5] [5] LIU D P,LI Z Z,LIU B,et al.Infrared small target detection in heavy sky scene clutter based on sparse representation［J］.Infrared Physics & Technology,2017,85:13-31.

[6] [6] HE Y J,LI M,ZHANG J L,et al.Small infrared target detection based on low-rank and sparse representation［J］.Infrared Physics & Technology,2015,68:98-109.

[9] [9] BOCCIGNONE G,CHIANESE A,PICARIELLO A.Small target detection using wavelets［C］//The 14th International Conference on Pattern Recognition,1998:1776-1778.

[13] [13] KOSKINEN L,ASTOLA J T,NEUVO Y A.Soft morphological filters:a robust morphological filtering method［J］.Journal of Electronic Imaging,1994,3(1):60-70.

[14] [14] KUOSMANEN P,ASTOLA J.Soft morphological filtering［J］.Journal of Mathematical Imaging and Vision,1995,5(3):231-262.

[15] [15] DONG Y Z,WANG C J,ZHOU X D.Structuring element in detection of IR images based on soft mathematical morphology［J］.Proceedings of SPIE-The International Society for Optical Engineering,2003,5203:571-580.

[18] [18] JOURLIN M,LAGET B,MATHERON G,et al.Image analysis and mathematical morphology.Vol.2.theoretical advances［M］.London:Academic Press,Inc.,1988.