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1998 Fiscal Year Final Research Report Summary

Development of a Method for Pig Weight Measurement by Image Analysis.

Research Project

Project/Area Number 08660320
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生物環境
Research InstitutionKitasato University

Principal Investigator

MINAGAWA Hideo  Kitasato University, Faculty of Eng.for Animal Husbandry, Assistant Professor, 獣医畜産学部, 講師 (70146520)

Project Period (FY) 1996 – 1998
KeywordsPig / Weight / Image Analysis / Projected Area / Height / Light Projection
Research Abstract

9. A method was developed to estimate pig weight with image analysis. Analysis proceeded from the relationship between specified projected area of a pig from above and its live weight. Specified projected image area, which lacked ears and tail image areas, had an exponential relationship with weight for 323 pigs. The experimental pigs, weighing from 4.2 kg to 114.2 kg, consisted of 12 kinds of two-crossbreeds of Landrace, Duroc, Large White, and Hampshire. The relationship depended on a type of two-crossbreed. Height difference was the major reason of the difference in the regression equation rather than length or mean width differences. Dimensional analysis in the multiple regression equation of specified projected area and height with weight conducted that it was most close to 3 dimension, meaning volume. Hence if pig height could be measured indirectly, it will be achieved to estimate pig weight with about *5% accuracy using the multiple regression equation of specified projected area and height.
Projecting light on pig with a lamp and measuring shadow length at shoulder of the pig with image analysis were attempted to estimate pig height using a geometrical relation between shadow length with light incident angle. Seven pigs, weighing from 47.6 kg to 107 kg, were experimented to compare with direct measurement of pig height. Heights for five pigs were estimated with a mean error of*4.6%. However more than *10% error were obtained for two pigs. It was the reason that shadow at belly not at. shoulder was measured. Thus, an indirect method was conducted to estimate pig height using light projection and image analysis technique. The method allows for rapid estimation of pig weight.

  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 皆川秀夫: "家畜体重の遠隔測定及び畜舎の熱環境の改善と普及" 農業気象. 54 (4). 353-357 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Minagawa, H.: "Estimating pig weight with a video camera" Proc. 5th Intern. Livestock Environment Symp. ASAE ISBN O-929355-84-9. 2. 453-460 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 皆川 秀夫: "養豚における電気利用" 農業電化. 49 (11). 7-12 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 皆川秀夫 他13名: "農林水産における新しい電気利用" 農業電化協会, 245 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Minagawa, H.: "Estimating pig weight with a video camera" Proc.5^<th> Inter.Livestock Environment Symp., American Society Agricultural Engineers ISBN 0-929355-84-9. Vol.2. 453-460 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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