I. INTRODUCTION

II. THE THREE CATEGORIES OF HU METHODS

III. REVIEW OF THE STATE-OF-THE-ART HU METHODS
A. Non-negative Matrix Factorization (i.e., NMF)
B. The NMF extensions with constraints on the abundances
C. The NMF extensions with constraints on the endmembers

IV. HOW TO LABEL GROUND TRUTHS IN THE HU?
A. The Endmember labeling
B. The Abundance labeling

V. THE REAL HYPERSPECTRAL IMAGES

VI. THE SIMULATED HYPERSPECTRAL IMAGE

VII. EXPERIMENTS RESULTS OF 5 BENCHMARK HU METHODS ON THE 18 HYPERSPECTRAL IMAGES
A. Five Benchmark Methods Compared in this Section
B. Experiment Settings and Experiment Results

VIII. CONCLUSION