Image analysis as a tool to quantify rigor contraction in pre-rigor-filleted fillets

  • Authors:

  • Lars Helge Stien;Jorma Suontama;Anders Kiessling

  • Affiliations:

  • Department of Biology, University of Bergen, P.O. Box 7800, NO-5020 Bergen, Norway;Institute of Marine Research, Matre Research Station, NO-5984 Matredal, Norway;Institute of Marine Research, Matre Research Station, NO-5984 Matredal, Norway

  • Venue:
  • Computers and Electronics in Agriculture
  • Year:
  • 2006

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Abstract

This paper describes and evaluates an economical and efficient online image analysis method for registering length changes in pre-rigor-filleted fillets during rigor contraction. The study aimed to develop image analysis methods for distinguishing between fillet, background and morphological location markers placed on the fillet, to test mathematical shape descriptors for the online registration and to test the image analysis results against measurements of contraction and isometric tension by a rigor-meter. Pre-rigor-filleted fillets of rainbow trout (Oncorhyncus mykiss) were used as a case study to determine whether: (1) changes in whole fillet are indicative of changes in individual parts of the fillet, (2) changes in contraction length measured on the fillet are indicative of changes in contraction observed in isolated (excised) muscle strips and (3) contraction measured in a whole fillet is indicative of isometric tension in isolated muscle strips. The contraction of whole, pre-rigor-filleted, fillet was highly correlated with contraction of its parts (r=0.92 (p