@INPROCEEDINGS{KovacsICIP09,
author={Kov\'acs, Andrea and Szir\'anyi, Tam\'as},
booktitle={Image Processing (ICIP), 2009 16th IEEE International Conference on}, 
title={Local contour descriptors around scale-invariant keypoints},
year={2009},
month={nov.},
pages={1105 -1108},
}