Classification of game meat species Springbok (Antidorcas marsupialis) and Blesbok (Damaliscus pygargus phillipsi) with NIR hyperspectral imaging
Date
2020-12
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Abstract
ENGLISH ABSTRACT: Game meat is a lucrative alternative to domesticated meat. It is lower in fat and is an organic
product, as it complies with organic agricultural enterprises. However, the game meat industry
operates as a free-market in South Africa and is a high value product, making it a vulnerable
target to food fraud. The development of methods to assess the authenticity of game meat would be a
favourable investment for both the consumer and producers. Thus, this investigation aimed to
classify different game meat species, namely Springbok (Antidorcas marsupialis) and Blesbok
(Damaliscus pygargus phillipsi) using NIR hyperspectral imaging. Additionally, classification of
the different muscles, namely the longissimus thoracis et lumborum (LTL), biceps femoris (BF),
semimembranosus (SM), semitendinosus (ST), infraspinatus (IS) and supraspinatus (SS), and
classification the species irrespective of the muscle was investigated. NIR hyperspectral imaging
offers rapid measurement of data, and provide both spatial and spectral information. Two analytical
approaches, namely pixel and object wise were investigated. Multivariate analysis techniques,
namely principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA)
were applied for exploratory and classification purposes, respectively. Object-wise analysis
performed better in comparison to pixel-wise, with the classification accuracies of 95.90 and 71.49
% respectively. Additionally, the species could successfully be classified when using one muscle
and when any muscle of the six muscles was used. Classification of the muscles was successful,
however, grouping into hindquarter (containing the BF, ST, SM), forequarter (containing the IS and
SS) and LTL had to be done to achieve this. Moreover, despite the successful classification, the
other statistical parameters used to assess models were
unsatisfactory.
AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar.
AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar.
Description
Thesis (MScFoodSc)--Stellenbosch University, 2020.
Keywords
Game meat -- Classification -- South Africa, Blesbok -- Carcasses, Springbok -- Carcasses, NIR hyperspectral imaging, Variable importance in projection (VIP), Wildlife as food, Chemometrics, Principal components analysis, UCTD