Method and apparatus for counting underwater objects using an ul

Details Method and apparatus for counting underwater objects using an ul Method and apparatus for counting underwater objects using an ul

1994-10-27

1997-11-25

Johns, Andrew

Image analysis

Applications

Target tracking or detecting

382100, 382206, 73624, 377 6, G06K 900, G06K 932, G01N 2904, G06M 700

Patent

active

056920644

ABSTRACT:
A number of fish may be counted by emitting an ultrasonic wave or an electromagnetic wave toward a predetermined area of a body of water where fish pass (e.g., a fish farming pool, a river or the like). Reflected waves are received from the fish bodies so that the reflected waves received from a cross section of the predetermined area are periodically stored. An ultrasonic wave fish shade image is produced that shows changes of fish shades. Fish are counted by performing an image processing which discriminates the ultrasonic wave fish shade image based on a predetermined fish shade decision rule. This arrangement reduces errors occuring due to muddiness and dust in the water and allows an automatic continuous fish counting ability over a long time period.

REFERENCES:
patent: 4023135 (1977-05-01), Hanmura et al.
patent: 4104609 (1978-08-01), Minegushi et al.
patent: 4112419 (1978-09-01), Kinoshita et al.
patent: 4439844 (1984-03-01), Menin
patent: 4628520 (1986-12-01), Menger
patent: 4963035 (1990-10-01), McCarthy
patent: 5005192 (1991-04-01), Duss
"A Designing of Fish Pass", Hirose et al., Sankaido Shuppan (see Specification p. 1).

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