Estimating mass of harvested Asian seabass Lates calcarifer from images

Journal Publication ResearchOnline@JCU
Konovalov, Dmitry A.;Saleh, Alzayat;Domingos, Jose A.;White, Ron D.;Jerry, Dean R.
Abstract

Total of 1072 Asian seabass or barramundi (Lates calcarifer) were harvested at two different locations in Queensland, Australia. Each fish was digitally photographed and weighed. A subsample of 200 images (100 from each location) were manually segmented to extract the fish-body area (S in cm2), excluding all fins. After scaling the segmented images to 1mm per pixel, the fish mass values (M in grams) were fitted by a single-factor model ( M=aS1.5 , a=0.1695 ) achieving the coefficient of determination (R2) and the Mean Absolute Relative Error (MARE) of R2=0.9819 and MARE=5.1% , respectively. A segmentation Convolutional Neural Network (CNN) was trained on the 200 hand-segmented images, and then applied to the rest of the available images. The CNN predicted fish-body areas were used to fit the mass-area estimation models: the single-factor model, M=aS1.5 , a=0.170 , R2=0.9819 , MARE=5.1% ; and the two-factor model, M=aSb , a=0.124 , b=0.155 , R2=0.9834 , MARE=4.5%

Journal

World Journal of Engineering and Technology

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Volume

6

ISBN/ISSN

2331-4222

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Issue

3

Pages Count

9

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Publisher

Scientific Research

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EISSN

N/A

DOI

10.4236/wjet.2018.63B003