Takayuki Fujiwara Kazuhiko Yamaashi Hiroyasu Koshimizu Proposals of Co-occurrence Frequency Image Based Filters. 260-263 2007 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/2007CD/papers/08-09.pdf conf/mva/2007 db/conf/mva/mva2007.html#FujiwaraYK07