Journal of Astronautics ›› 2015, Vol. 36 ›› Issue (12): 1453-1458.doi: 10.3873/j.issn.1000-1328.2015.12.015

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A Fast Earth Ultraviolet Center Extraction Algorithm

ZHANG Han mo, LU Shan, YANG Wen bo, LV Chun guang   

  1. 1. Shanghai Key Laboratory of Aerospace Intelligent Control Technology, Shanghai 201109, China;
     2. Shanghai Institute of Spaceflight Control Technology, Shanghai 201109, China;
    3. International Institute for Earth System Science, Nanjing University, Nanjing 210023, Chin
  • Received:2014-12-14 Revised:2015-06-14 Online:2015-12-15 Published:2015-12-25


A fast earth center extraction algorithm based on gradient statistic is proposed to accurately extract the earth ultraviolet center point.First, a fast edge detector combining Sobel edge operator with LBP(Local binary pattern) feature descriptor is proposed to balance computer property of on-board computer and high memory consumer of filter algorithm. This proposed edge detector can both filter background noises and extract earth ultraviolet edge features. Then earth center is obtained by using least square fitting forthe non-integrity ring edge. Experiments show the proposed method is noise immunity and provides a sub-pixel level earth center, with a remarkable low requirement for memory capacityand real-time computation. Specially, at memory space of 1100kByte, the method provides accurate earth center within 20ms, thus satisfying the requirement for autonomous navigation.

Key words: Ultraviolet image, Gradient map, Least square fitting, LBP feature

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