Semisupervised hyperspectral image unmixing using a variational Bayes   algorithm
  This technical report presents a variational Bayes algorithm for semisupervised hyperspectral image unmixing. The presented Bayesian model employs a heavy tailed, nonnegatively truncated Laplace prior over the abundance coefficients. This prior imposes both the sparsity assumption and the nonnegativity constraint on the abundance coefficients. Experimental results conducted on the Aviris Cuprite data set are presented that demonstrate the effectiveness of the proposed method. 
Konstantinos E. Themelis, Athanasios A. Rontogiannis, Konstantinos D.   Koutroumbas
stat.ME