Shadow Removal from VNIR Hyperspectral Remote Sensing Imagery with Endmember Signature Analysis

Omruuzun F., Baskurt D. O., Daglayan H., Cetin Y. Y.

Conference on Next-Generation Spectroscopic Technologies VIII, Maryland, Amerika Birleşik Devletleri, 20 - 22 Nisan 2015, cilt.9482 identifier identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 9482
  • Doi Numarası: 10.1117/12.2190066
  • Basıldığı Şehir: Maryland
  • Basıldığı Ülke: Amerika Birleşik Devletleri
  • Anahtar Kelimeler: airborne hyperspectral imaging, shadow removal, hyperspectral unmixing, ALGORITHM
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

This study aims to develop an effective regional shadow removal algorithm using rich spectral information existing in hyperspectral imagery. The proposed method benefits from spectral similarity of shadow and neighboring nonshadow pixels regardless of the intensity values. Although the shadow area has lower reflectance values due to inadequacy of incident light, it is expected that this area contains similar spectral characteristics with nonshadow area. Using this assumption, the endmembers in both shadowed and nonshadow area are extracted by Vertex Component Analysis (VCA). On the other hand, HySime algorithm overcomes estimating number of endmembers, which is one of the challenging parts in hyperspectral unmixing. Therefore, two sets of endmembers are extracted independently for both shadowed and nonshadow area. The proposed study aims at revealing the relation between these two endmember sets by comparing their pairwise similarities. Finally, reflectance values of shadowed pixels are re-calculated separately for each spectral band of hyperspectral image using this information.