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- José M. P. Nascimento, José M. Bioucas-Dias
- IEEE Trans. Geoscience and Remote Sensing
- 2005

Given a set of mixed spectral (multispectral or hyperspectral) vectors, linear spectral mixture analysis, or linear unmixing, aims at estimating the number of reference substances, also called endmembers, their spectral signatures, and their abundance fractions. This paper presents a new method for unsupervised endmember extraction from hyperspectral data,… (More)

- José M. Bioucas-Dias, Mário A. T. Figueiredo
- IEEE Transactions on Image Processing
- 2007

Iterative shrinkage/thresholding (1ST) algorithms have been recently proposed to handle a class of convex unconstrained optimization problems arising in image restoration and other linear inverse problems. This class of problems results from combining a linear observation model with a nonquadratic regularizer (e.g., total variation or wavelet-based… (More)

- Manya V. Afonso, José M. Bioucas-Dias, Mário A. T. Figueiredo
- IEEE Transactions on Image Processing
- 2010

We propose a new fast algorithm for solving one of the standard formulations of image restoration and reconstruction which consists of an unconstrained optimization problem where the objective includes an <i>l</i><sub>2</sub> data-fidelity term and a nonsmooth regularizer. This formulation allows both wavelet-based (with orthogonal or frame-based… (More)

Imaging spectrometers measure electromagnetic energy scattered in their instantaneous field view in hundreds or thousands of spectral channels with higher spectral resolution than multispectral cameras. Imaging spectrometers are therefore often referred to as hyperspectral cameras (HSCs). Higher spectral resolution enables material identification via… (More)

- Manya V. Afonso, José M. Bioucas-Dias, Mário A. T. Figueiredo
- IEEE Transactions on Image Processing
- 2011

We propose a new fast algorithm for solving one of the standard approaches to ill-posed linear inverse problems (IPLIP), where a (possibly nonsmooth) regularizer is minimized under the constraint that the solution explains the observations sufficiently well. Although the regularizer and constraint are usually convex, several particular features of these… (More)

- Marian-Daniel Iordache, José M. Bioucas-Dias, Antonio J. Plaza
- IEEE Trans. Geoscience and Remote Sensing
- 2011

Linear spectral unmixing is a popular tool in remotely sensed hyperspectral data interpretation. It aims at estimating the fractional abundances of pure spectral signatures (also called endmembers) in each mixed pixel collected by an imaging spectrometer. In many situations, the identification of endmember signatures in the original data set may be… (More)

- José M. Bioucas-Dias
- 2009 First Workshop on Hyperspectral Image and…
- 2009

This paper presents a new linear hyperspectral unmixing method of the minimum volume class, termed simplex identification via split augmented Lagrangian (SISAL). Following Craig's seminal ideas, hyperspectral linear unmixing amounts to finding the minimum volume simplex containing the hyperspectral vectors. This is a nonconvex optimization problem with… (More)

- José M. Bioucas-Dias, José M. P. Nascimento
- IEEE Trans. Geoscience and Remote Sensing
- 2008

Signal subspace identification is a crucial first step in many hyperspectral processing algorithms such as target detection, change detection, classification, and unmixing. The identification of this subspace enables a correct dimensionality reduction yielding gains in algorithm performance and complexity and in data storage. This paper introduces a new… (More)

- Jun Li, José M. Bioucas-Dias
- IGARSS
- 2008

This paper presents a new method of minimum volume class for hyperspectral unmixing, termed minimum volume simplex analysis (MVSA). The underlying mixing model is linear; i.e., the mixed hyperspectral vectors are modeled by a linear mixture of the endmember signatures weighted by the correspondent abundance fractions. MVSA approaches hyperspectral unmixing… (More)

- Mário A. T. Figueiredo, José M. Bioucas-Dias, Robert D. Nowak
- IEEE Trans. Image Processing
- 2007

Standard formulations of image/signal deconvolution under wavelet-based priors/regularizers lead to very high-dimensional optimization problems involving the following difficulties: the non-Gaussian (heavy-tailed) wavelet priors lead to objective functions which are nonquadratic, usually nondifferentiable, and sometimes even nonconvex; the presence of the… (More)