Multi-Temporal Classification And Change Detection Using UAV Images

Salma Makuti, F.C. Nex, M.Y. Yang

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

10 Citations (Scopus)
547 Downloads (Pure)


In this paper different methodologies for the classification and change detection of UAV image blocks are explored. UAV is not only the cheapest platform for image acquisition but it is also the easiest platform to operate in repeated data collections over a changing area like a building construction site. Two change detection techniques have been evaluated in this study: the pre-classification and the post-classification algorithms. These methods are based on three main steps: feature extraction, classification and change detection. A set of state of the art features have been used in the tests: colour features (HSV), textural features (GLCM) and 3D geometric features. For classification purposes Conditional Random Field (CRF) has been used: the unary potential was determined using the Random Forest algorithm while the pairwise potential was defined by the fully connected CRF. In the performed tests, different feature configurations and settings have been considered to assess the performance of these methods in such challenging task. Experimental results showed that the post-classification approach outperforms the pre-classification change detection method. This was analysed using the overall accuracy, where by post classification have an accuracy of up to 62.6% and the pre classification change detection have an accuracy of 46.5%. These results represent a first useful indication for future works and developments.
Original languageEnglish
Title of host publication 2018 ISPRS TC II Mid-term Symposium “Towards Photogrammetry 2020”, 4–7 June 2018, Riva del Garda, Italy
Place of PublicationRiva Del Garda
PublisherInternational Society for Photogrammetry and Remote Sensing (ISPRS)
Number of pages8
Publication statusPublished - 6 Jun 2018

Publication series

NameThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences


  • Fully connected CRF
  • Change detection
  • UAV images
  • Random forest


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