Ryosuke Harakawa, Takahiro Ogawa, Miki Haseyama. Extraction of hierarchical structure of web communities including salient keyword estimation for web video retrieval. In 2015 IEEE International Conference on Image Processing, ICIP 2015, Quebec City, QC, Canada, September 27-30, 2015. pages 1021-1025, IEEE, 2015. [doi]