Spatial stimuli gradient sketch model. Mathew, J. J. and James, A. P. IEEE Signal Processing Letters, 22(9):1336–1339, IEEE, 2015.
bibtex   
@article{mathew2015spatial,
  title={Spatial stimuli gradient sketch model},
  author={Mathew, Joshin John and James, Alex Pappachen},
  journal={IEEE Signal Processing Letters},
  volume={22},
  number={9},
  pages={1336--1339},
  year={2015},
  publisher={IEEE}
}
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