Analysis of bat wing beat frequency using Fourier transform

Atanbori, John and Cowling, Peter and Murray, John and Colston, Belinda and Eady, Paul and Hughes, Dave and Nixon, Ian and Dickinson, Patrick (2013) Analysis of bat wing beat frequency using Fourier transform. In: Computer Analysis of Images and Patterns, 27 - 29 Aug 2013 , York.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive

Abstract

Computer vision techniques have been used extensively to automatically monitor human activities; however, applications for analysing animal behaviour are sparse. The analysis of bat behaviour in particular has attracted only one or two studies. Most existing work uses either expensive thermal imaging equipment, or bespoke sensors which are not accessible to field researchers, ecologists, and scientists studying behaviour. The work we present here uses spectral analysis techniques to quantify wingbeat frequency, using a single imaging device in low-light. We propose two modified techniques based on bounded box metrics, and similarity matrices, for measuring periodic and cyclical motion as a 1D time domain signal. These are transformed to the frequency domain using Short Time Fourier Transform (STFT). Finally we evaluate these techniques against the baseline algorithm proposed by Cutler and Davis [5], using expert-annotated ground-truth data.

Keywords:Wing beat frequency, STFT, Similarity matrices, Periodic motion
Subjects:G Mathematical and Computer Sciences > G400 Computer Science
Divisions:College of Science > School of Computer Science
College of Science > School of Life Sciences
ID Code:11745
Deposited On:29 Aug 2013 06:55

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