Feedforward Categorization on AER Motion Events Using Cortex-Like Features in a Spiking Neural Network

• Main Authors: Zhao, Bo, Ding, Ruoxi, Chen, Shoushun, Linares-Barranco, Bernabe, Tang, Huajin
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2015
• Subjects: MNIST; Spiking neural network; Event driven; Feedforward categorization; Address event representation (AER)
• Online Access: https://hdl.handle.net/10356/81364; http://hdl.handle.net/10220/39239
• Institution: Nanyang Technological University

This paper introduces an event-driven feedforward categorization system, which takes data from a temporal contrast address event representation (AER) sensor. The proposed system extracts bio-inspired cortex-like features and discriminates different patterns using an AER based tempotron classifier (a network of Leaky Integrate-and-Fire spiking neurons). One of the system’s most appealing characteristics is its event-driven processing, with both input and features taking the form of address events (spikes). The system was evaluated on an AER posture dataset and compared to two recently developed bio-inspired models. Experimental results have shown that it consumes much less simulation time while still maintaining comparable performance. In addition, experiments on the Mixed National Institute of Standards and Technology (MNIST) image dataset have demonstrated that the proposed system can work not only on raw AER data but also on images (with a preprocessing step to convert images into AER events) and that it can maintain competitive accuracy even when noise is added. The system was further evaluated on the MNIST-DVS dataset (in which data is recorded using an AER dynamic vision sensor), with testing accuracy of 88.14%.