Linear spectral unmixing is an effective technique to estimate the abundances of materials present in each hyperspectral image pixel. Recently, sparse-regression-based unmixing approaches have been proposed to tackle this problem. Mostly, <i>l</i><sub>1</sub> norm minimization is used to approximate the <i>l</i><sub>0</sub> norm minimization problem in terms of computational complexity. In this letter, we model the hyperspectral unmixing as a constrained sparse <i>lp</i> - <i>l</i><sub>2</sub… CONTINUE READING