A neuromorphic depth-from-motion vision model with STDP adaptation.
We propose a simplified depth-from-motion vision model based on leaky integrate-and-fire (LIF) neurons for edge detection and two-dimensional depth recovery. In the model, every LIF neuron is able to detect the irradiance edges passing through its receptive field in an optical flow field, and respond to the detection by firing a spike when the neuron's firing criterion is satisfied. If a neuron fires a spike, the time-of-travel of the spike-associated edge is transferred as the prediction information to the next synapse-linked neuron to determine its state. Correlations between input spikes and their timing thus encode depth in the visual field. The adaptation of synapses mediated by spike-timing-dependent plasticity is used to improve the algorithm's robustness against inaccuracy caused by spurious edge propagation. The algorithm is characterized on both artificial and real image sequences. The implementation of the algorithm in analog very large scale integrated (aVLSI) circuitry is also discussed.
Yang
Zhijun
Z
Department of Computer Science, Nanjing Normal University, Nanjing 210097, China. zhijun.yang@ed.ac.uk
Murray
Alan
A
Wörgötter
Florentin
F
Cameron
Katherine
K
Boonsobhak
Vasin
V
D000818:Animals; D032701:Biomimetics / Q000379:methods*; D003198:Computer Simulation; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D008959:Models, Neurological; D009039:Motion Perception / Q000502:physiology*; D009415:Nerve Net / Q000502:physiology*; D016571:Neural Networks, Computer; D010363:Pattern Recognition, Automated / Q000379:methods; D014795:Visual Pathways / Q000502:physiology*