Japan journal of water pollution research
Print ISSN : 0387-2025
Image automonitoring system of fish movement patterns for detecting acute toxity in fresh water
Studies on image recognition
Kenji BABAHayao YAHAGI
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1988 Volume 11 Issue 2 Pages 114-122,92

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Abstract
A fish image automonitoring system for detecting acute toxicity in water purification plants was studied experimentally. A stable image taking technique for fish was developed based on a lighting method, in which a translucent backscreen behind the water tank was illuminated and then scattered by the illumination lamp. An effective fish image recognition method, regardless to the degree of turbidity, was found, which was based on the histogram of the gray image.
The image automonitoring technique, in which both the location profile and the velocity profile of a fish swimming in the water tank was applied to evaluation of fish movement patterns. The normal movement patterns of carp (Cyprinus carpio), crucian carp (Carassius carassius buergeri), and broadstriped biteling (Rhodeus osellatus osellatus) differed from those under toxic conditions (cyanide ion= 0.1 mg·l-1). Then toxicity could be detected on the basis of differences in fish movement patterns as determined by the image automonitoring system.
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© Japan Society on Water Environment
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