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Bag of Class Posteriors, a new multivariate time series classifier applied to animal behaviour identification

journal contribution
posted on 2023-05-18, 12:22 authored by Smith, D, Dutta, R, Hellicar, A, Bishop-Hurley, G, Richard RawnsleyRichard Rawnsley, Henry, D, James HillsJames Hills, Timms, G

Class Posteriors (BOCP) and the Bag of Class Posterior with Ordering (BOCPO). The models propose a new multi-scale feature representation where the class posterior estimates of contiguous local patterns are aggregated over longer time scales. The models are employed as part of an animal behaviour monitoring system that are comprised of sensors, which are fitted to the animals, and a classifier that translates sensor data into knowledge of the animal’s behaviour.

Animal monitoring systems are commonly developed to infer a small number of behaviours with relevance to a specific application. To investigate if a standard monitoring system with an Inertial Measurement Unit (IMU) can be reused for different management applications, a set of ten cattle behaviours relevant to different management applications were classified with the proposed models. Results indicate that the multi-scale BOCP and BOCPO models were far more capable of classifying the cow behaviours offering a 43% to 77% improvement over benchmark time interval classifiers with fixed time resolution. In addition, the BOCPO model was shown to offer a far more efficient feature representation than the related multi-scale Bag of Features (BOF) classifier (up to 200 times smaller) making it better suited to deploy upon monitoring devices fitted to animals in the field.

History

Publication title

Expert Systems With Applications

Volume

42

Issue

7

Pagination

3774-3784

ISSN

0957-4174

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

Rights statement

Copyright 2014 Elsevier Ltd

Repository Status

  • Restricted

Socio-economic Objectives

Dairy cattle

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