@inproceedings{discriminativelytrainedsparsecode,
  title = {Discriminatively Trained Sparse Code Gradients for Contour Detection},
  author = {Ren Xiaofeng and Liefeng Bo},
  year = {2012},
  booktitle = {NeurIPS 2012 12},
  url = {http://papers.nips.cc/paper/4787-discriminatively-trained-sparse-code-gradients-for-contour-detection},
}