Noritaka Yamashita Munenori Ogura Jianming Lu Hiroo Sekiya Takashi Yahagi A random-valued impulse noise detector using level detection. 6292-6295 2005 conf/iscas/2005 ISCAS (6) http://dx.doi.org/10.1109/ISCAS.2005.1466079 db/conf/iscas/iscas2005-6.html#YamashitaOLSY05