Spectral-spatial classification of hyperspectral images with semi-supervised graph learning

Renbo Luo, Wenzhi Liao, Hongyan Zhang, Youguo Pi, Wilfried Philips

Research output: Contribution to conferencePaperpeer-review


In this paper, we propose a novel semi-supervised graph leaning method to fuse spectral (of original hyperspectral (HS) image) and spatial (from morphological features) information for classification of HS image. In our proposed semi-supervised graph, samples are connected according to either label information (labeled samples) or their k-nearest spectral and spatial neighbors (unlabeled samples). Furthermore, we link the unlabeled sample with all labeled samples in one class which is the closest to this unlabeled sample in both spectral and spatial feature spaces. Thus, the connected samples have similar characteristics on both spectral and spatial domains, and have high possibilities to belong to the same class. By exploiting the fused semi-supervised graph, we then get transformation matrices to project high-dimensional HS image and morphological features to their lower dimensional subspaces. The final classification map is obtained by concentrating the lower-dimensional features together as an input of SVM classifier. Experimental results on a real hyperspectral data demonstrate the efficiency of our proposed semi-supervised fusion method. Compared to the methods using unsupervised fusion or supervised fusion, the proposed semi-supervised fusion method enables improved performances on classification. Moreover, the classification performances keep stable even when a small number of labeled training samples is available.
Original languageEnglish
Number of pages6
Publication statusPublished - 2016
EventConference on Image and Signal Processing for Remote Sensing XXII - Edinburgh, United Kingdom
Duration: 26 Sep 201629 Sep 2016


ConferenceConference on Image and Signal Processing for Remote Sensing XXII
Country/TerritoryUnited Kingdom


  • spectral-spatial
  • semi-supervised
  • hyperspectral images
  • classification
  • feature extraction
  • graph


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