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Virtual reality for animal navigation with camera-based optical flow tracking

  • Background: Virtual reality combined with spherical treadmills is used across species for studying neural circuits underlying navigation. New Method: We developed an optical flow-based method for tracking treadmil ball motion in real-time using a single high-resolution camera. Results: Tracking accuracy and timing were determined using calibration data. Ball tracking was performed at 500 Hz and integrated with an open source game engine for virtual reality projection. The projection was updated at 120 Hz with a latency with respect to ball motion of 30 ± 8 ms. Comparison: with Existing Method(s) Optical flow based tracking of treadmill motion is typically achieved using optical mice. The camera-based optical flow tracking system developed here is based on off-the-shelf components and offers control over the image acquisition and processing parameters. This results in flexibility with respect to tracking conditions – such as ball surface texture, lighting conditions, or ball size – as well as camera alignment and calibration. Conclusions: A fast system for rotational ball motion tracking suitable for virtual reality animal behavior across different scales was developed and characterized.

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Metadaten
Document Type:Preprint
Language:English
DOI:https://doi.org/10.1101/579813
Publisher:bioRxiv
Date of first publication:2019/03/16
Submission status:Preprint submitted to Journal of Neuroscience Methods
Note:
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
Tag:Ball Tracking; Drosophila; Navigation; Real-Time Image Processing; Spherical Treadmill; Virtual Reality; optical flow
Departments, institutes and facilities:Fachbereich Informatik
Dewey Decimal Classification (DDC):0 Informatik, Informationswissenschaft, allgemeine Werke / 00 Informatik, Wissen, Systeme / 006 Spezielle Computerverfahren
Entry in this database:2019/05/09
Licence (German):License LogoCreative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International