Antonelli, Terry & Wands
Apparatus for monitoring the toxicant contamination of water by using aquatic animals
 A fish is bred in a transparent basin, into which water to be tested is supplied. A light source and a television camera are arranged in such a manner that images of the fish are taken by the camera as a silhouette. From the thus obtained fish images, the frequency distribution of the gravity centers of the fish images in the direction of the depth of water are obtained. The abnormality of the behavior of the fish is detected by comparison of the obtained frequency distribution with a reference distribution provided in advance. 
Hitachi Engineering Co., Ltd. Hitachi, Ltd.
G G G G
G06V G01N G06T G06T
inventional inventional additional inventional
Naoki Hayao Mikio Kenji Shunji Masahiko Takashi Shoji Takashi
Hara Yahagi Yoda Baba Mori Ishida Iida Watanabe Katori