Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회지)

Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회)
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Extraction of Changed Pixels for Hyperion Hyperspectral Images Using Range Average Based Buffer Zone Concept

구간평균 그래프 기반의 버퍼존 개념을 적용한 Hyperion 초분광영상의 변화화소 추출

  • 김대성 (건국대학교 신기술융합학과) ;
  • 편무욱 (건국대학교 신기술융합학과)
  • Received : 2011.09.21
  • Accepted : 2011.09.30
  • Published : 2011.10.31
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Abstract

This study is aimed to perform more reliable unsupervised change detection through the re-extraction of the changed pixels which were extracted with global thresholding by applying buffer zone concept. First, three buffer zone was divided on the basis of the thresholding value which was determined using range average and the maximum distance point from a straight line. We re-extracted the changed pixels by performing unsupervised classification for buffer zone II which consists of changed pixels and unchanged pixels. The proposed method was implemented in Hyperion hyperspectral images and evaluated comparing to the existing global thresholding method. The experimental results demonstrated that the proposed method performed more accuracy change detection for vegetation area even if extracted slightly more changed pixels.

본 연구는 단일 임계값으로 결정된 변화화소를 버퍼존 개념을 적용하여 재추출함으로써, 보다 신뢰도 높은 무감독변화탐지를 수행하는데 목적이 있다. 우선, 그래프 생성기법과 직선과의 최대거리를 통해 결정된 임계값을 기반으로 세 개의 버퍼존을 생성하였다. 이 중 변화화소와 무변화화소가 혼재하는 구간인 버퍼존II에 대해 무감독분류를 수행하여 변화화소를 재추출하였다. Hyperion 초분광영상을 사용하여 제안기법을 적용하였으며, 단일 임계값 방법을 적용한 변화탐지 결과와의 비교를 통해 제안기법의 성능을 평가하였다. 결과를 통해, 버퍼존 기법이 다소 많은 변화화소를 추출하였으나, 산림지역에 대해 보다 정확한 변화탐지를 수행함을 확인할 수 있었다.

Keywords

References

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