Hiroto Nagayoshi Takashi Watanabe Tatsuhiko Kagehiro Hisao Ogata Tsukasa Yasue Hiroshi Sako Detection of a Hand Holding a Cellular Phone Using Multiple Image Features. 151-160 2009 ICIAP http://dx.doi.org/10.1007/978-3-642-04146-4_18 conf/iciap/2009 db/conf/iciap/iciap2009.html#NagayoshiWKOYS09