Notice of retraction
Vol. 32, No. 8(2), S&M2292

ISSN (print) 0914-4935
ISSN (online) 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Method for Measuring Length of Free-swimming Farmed Fry by 3D Monitoring

Koji Abe, Koki Miyake, and Hitoshi Habe

(Received March 31, 2020; Accepted June 2, 2020)

Keywords: image processing, 3D monitoring, stereo camera, direct linear transformation, aquaculture

To monitor continuous growth of farmed fry, we present an automated method for measuring the length of free-swimming fry in a small aquarium. The proposed method detects the frame where a fish appears conveniently for the measurement in the swimming movie and estimates locations of its the snout and the caudal fin base from its shape characteristics. The length is measured as the distance between these two points in 3D space, whose 3D coordinates are obtained by the method of direct linear transformation. Performance of the proposed method was examined by applying it to 10 fish in each of 6 species, and the standard deviation of the error rates was less than 5%. In the best case, the mean value and standard deviation of the error rates were 6.6 and 1.7%, respectively.

Corresponding author: Koji Abe




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