SUN Weiwei, LIU Chun, SHI Beiqi, et al. Underlying features extraction using difference maps from manifold coordinates of hyperspectral imagery[J]. Journal of Remote Sensing, 2013,17(6):1427-1443.
SUN Weiwei, LIU Chun, SHI Beiqi, et al. Underlying features extraction using difference maps from manifold coordinates of hyperspectral imagery[J]. Journal of Remote Sensing, 2013,17(6):1427-1443. DOI: 10.11834/jrs.20132347.
Manifold coordinates from Isometric mapping(Isomap) and Local Tangent Space Alignment(LTSA) preserve the spectral features of ground objects from Hyperspectral Imagery(HSI) through nonlinear dimensionality reduction.However
the theoretical differences result in differing capabilities in preserving spectral features.Thus
a comparison of two coordinates can make the underlying features prominent.Therefore
this paper proposes an innovative method called Difference Maps from Manifold Coordinates(DMMC)
which is based on Isomap and LTSA
to extract underlying features.First
spectral interpretations are matched with both coordinates and ensured to preserve the same spectral features.Second
the Isomap and LTSA coordinates are transformed into a uniform system using coordinate normalization and axis-direction adjustment.Finally
the difference maps are obtained through subtraction operations between the weighted manifold maps
and underlying features are extracted using classical image processing approaches.Two case studies are performed to evaluate the proposed method
and the results are compared with those obtained u sing Isomap and LTSA.The results show that DMMC outperforms Isomap and LTSA in extracting underlying features
such as the underlying shallow water near the river bank and the low spatial-resolution road in the large image scene of a swamp.This method provides a novel scheme for extracting underlying features from HSI data.
关键词
高光谱影像非线性降维等距映射局部切空间排列流形坐标差异图
Keywords
hyperspectral imagerynonlinear dimensionality reductionIsometric mappinglocal tangent space alignmentdifference maps from manifold coordinates