Gravitation-based edge detection for hyperspectral images

Research output: Research - peer-reviewArticle

  • Genyun Sun
  • Aizhu Zhang
  • Jinchang Ren
  • Jingsheng Ma
  • Peng Wang
  • Yuanzhi Zhang
  • Xiuping Jia
Edge detection is one of the key issues in the field of computer vision and remote sensing image analysis. Although many different edge-detection methods have been proposed for gray-scale, color, and multispectral images, they still face difficulties when extracting edge features from hyperspectral images (HSIs) that contain a large number of bands with very narrow gap in the spectral domain. Inspired by the clustering characteristic of the gravitational theory, a novel edge-detection algorithm for HSIs is presented in this paper. In the proposed method, we first construct a joint feature space by combining the spatial and spectral features. Each pixel of HSI is assumed to be a celestial object in the joint feature space, which exerts gravitational force to each of its neighboring pixel. Accordingly, each object travels in the joint feature space until it reaches a stable equilibrium. At the equilibrium, the image is smoothed and the edges are enhanced, where the edge pixels can be easily distinguished by calculating the gravitational potential energy. The proposed edge-detection method is tested on several benchmark HSIs and the obtained results were compared with those of four state-of-the-art approaches. The experimental results confirm the efficacy of the proposed method.
Original languageEnglish
Article number592
Number of pages23
JournalRemote Sensing
StatePublished - 11 Jun 2017

    Research areas

  • edge detection, hyperspectral images, gravitation, remote sensing, feature space, image analysis

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