@article{chatzichristofis2011fast,
  title={Fast Retrieval from Image Databases via Binary Haar Wavelet Transform on the Color and Edge Directivity Descriptor},
  author={Chatzichristofis, Savvas and Boutalis, Yiannis and Arampatzis, Avi},
  journal={International Journal On Advances in Networks and Services},
  volume={4},
  number={1 and 2},
  pages={223--231},
  year={2011}
}