@ARTICLE{6891351, 
author={D. Huang and C. Zhu and Y. Wang and L. Chen}, 
journal={IEEE Transactions on Image Processing}, 
title={HSOG: A Novel Local Image Descriptor Based on Histograms of the Second-Order Gradients}, 
year={2014}, 
volume={23}, 
number={11}, 
pages={4680-4695}, 
keywords={feature extraction;gradient methods;image classification;image enhancement;image matching;novel local image descriptor;HSOG;retinal image;geometric surface;histogram of oriented gradient;local binary patterns;gradient location;orientation histogram;first-order gradient information;histograms of second-order gradients;SIFT;invariant feature transform;LBP;local image matching;visual object categorization;scene classification;image representation;Shape;Histograms;Visualization;Image color analysis;Vectors;Robustness;Geometry;Local image descriptor;feature extraction;second order gradients;image matching;object categorization;scene classification;Algorithms;Artificial Intelligence;Biomimetics;Computer Simulation;Humans;Image Enhancement;Image Interpretation, Computer-Assisted;Models, Statistical;Pattern Recognition, Automated;Reproducibility of Results;Sensitivity and Specificity}, 
doi={10.1109/TIP.2014.2353814}, 
ISSN={1057-7149}, 
month={Nov},}