Journal ArticleDOI
A transformation for ordering multispectral data in terms of image quality with implications for noise removal
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TLDR
In this paper, a transformation known as the maximum noise fraction (MNF) transformation is presented, which always produces new components ordered by image quality, and it can be shown that this transformation is equivalent to principal components transformations when the noise variance is the same in all bands and that it reduces to a multiple linear regression when noise is in one band only.Abstract:
A transformation known as the maximum noise fraction (MNF) transformation, which always produces new components ordered by image quality, is presented. It can be shown that this transformation is equivalent to principal components transformations when the noise variance is the same in all bands and that it reduces to a multiple linear regression when noise is in one band only. Noise can be effectively removed from multispectral data by transforming to the MNF space, smoothing or rejecting the most noisy components, and then retransforming to the original space. In this way, more intense smoothing can be applied to the MNF components with high noise and low signal content than could be applied to each band of the original data. The MNF transformation requires knowledge of both the signal and noise covariance matrices. Except when the noise is in one band only, the noise covariance matrix needs to be estimated. One procedure for doing this is discussed and examples of cleaned images are presented. >read more
Citations
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Journal ArticleDOI
Vertex component analysis: a fast algorithm to unmix hyperspectral data
TL;DR: A new method for unsupervised endmember extraction from hyperspectral data, termed vertex component analysis (VCA), which competes with state-of-the-art methods, with a computational complexity between one and two orders of magnitude lower than the best available method.
Journal ArticleDOI
Hyperspectral Unmixing Overview: Geometrical, Statistical, and Sparse Regression-Based Approaches
Jose M. Bioucas-Dias,Antonio Plaza,Nicolas Dobigeon,Mario Parente,Qian Du,Paul D. Gader,Jocelyn Chanussot +6 more
TL;DR: This paper presents an overview of un Mixing methods from the time of Keshava and Mustard's unmixing tutorial to the present, including Signal-subspace, geometrical, statistical, sparsity-based, and spatial-contextual unmixed algorithms.
Book
Remote sensing, models, and methods for image processing
TL;DR: The Nature of Remote Sensing: Introduction, Sensor Characteristics and Spectral Stastistics, and Spatial Transforms: Introduction.
Journal ArticleDOI
Estimation of land surface temperature-vegetation abundance relationship for urban heat island studies
TL;DR: In this article, the applicability of vegetation fraction derived from a spectral mixture model as an alternative indicator of vegetation abundance was investigated based on examination of a Landsat Enhanced Thematic Mapper Plus (ETM+) image of Indianapolis City, IN, USA, acquired on June 22, 2002.
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Spectral unmixing
Nirmal Keshava,John F. Mustard +1 more
TL;DR: The outputs of spectral unmixing, endmember, and abundance estimates are important for identifying the material composition of mixtures and the applicability of models and techniques is highly dependent on the variety of circumstances and factors that give rise to mixed pixels.
References
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Journal ArticleDOI
Standardized principal components
Ashbindu Singh,A. R. Harrison +1 more
TL;DR: In this article, principal components of two LANDSAT MSS subscenes were separately calculated using both unstandardized and standardized variables, and the results indicate substantial improvement in signal-to-noise ratio and image enhancement by using standardized variables in the principal components analysis.
Journal ArticleDOI
Information Extraction, SNR Improvement, and Data Compression in Multispectral Imagery
TL;DR: The Karhunen-Loeve transformation is applied to multispectral data for information extraction, SNR improvement, and data compression and provides a set of uncorrelated principal component images very useful in automatic classification and human interpretation.
Journal ArticleDOI
Agricultural land-cover discrimination using thematic mapper spectral bands
TL;DR: In this paper, multispectral scanner system data simulating the thematic mapper (TM) of LANDSAT-4 were analyzed for an area near Gedney Hill, Lincolnshire, U.K.
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