The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 19, 1989
Filed:
Sep. 04, 1987
Kenji Baba, Hitachi, JP;
Hayao Yahagi, Hitachi, JP;
Shoji Watanabe, Hitachi, JP;
Naoki Hara, Hitachi, JP;
Mikio Yoda, Tokai, JP;
Shunji Mori, Hitachi, JP;
Takashi Iida, Hitachi, JP;
Takashi Katori, Hitachi, JP;
Masahiko Ishida, Hitachi, JP;
Hitachi Engineering Co., Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
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.