Further information, validation and scientific basis of the optical flow system for assessing welfare can be found in the following publications:
Roberts, S.J., Cain, R. and Dawkins, M.S. (2012) Prediction of welfare outcomes for broiler chickens using Bayesian regression on continuous optical flow data. Royal Society Journal Interface (in press) doi: 10.1098/rsif.2012.0594
Dawkins, M.S., Cain, R. and Roberts, S.J. (2012) Optical flow,flock behaviour and chicken welfare. Animal Behaviour 84: 219-223
Lee, H.-J., Roberts, S. J., Drake, K .A. and Dawkins, M. S. (2011) Prediction of feather damage in laying hens using optical flows and Markov models. Journal of the Royal Society Interface 8: 489-499.
Dawkins, M.S., Lee, H.-J., Waitt, C.D. and Roberts, S.J. (2009) Optical flow patterns in broiler chickens as automated measures of behaviour and gait. Applied Animal Behaviour Science 119: 203-209.
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