Bio-inspired small target discrimination in high dynamic range natural scenes

Steven D. Wiederman, Russell S.A. Brinkworth, David C. O'Carroll

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)

Abstract

Flies have the capability to detect and track small moving objects, often against cluttered moving backgrounds. From both a physiological and engineering perspective, understanding this computational process is an intriguing challenge. We have developed a target detection model inspired from electrophysiological recordings of 'small target motion detector' neurons within the insect brain. Our numerical modeling represents the neural processing along a proposed pathway to this target-detecting neuron. We use high dynamic range, natural images, to represent 'real-world' luminance values that serve as inputs to a biomimetic representation of photoreceptor processing. Adaptive spatiotemporal high-pass filtering (1st-order interneurons) then shape the transient 'edge-like' responses, useful for feature discrimination. Nonlinear facilitation of independent 'on' and 'off' polarity channels (the rectifying, transient cells) allows for target discrimination from background, without the need for relative motion cues. We show that this form of feature discrimination works with targets embedded in a set of natural panoramic scenes that are animated to simulate rotation of the viewing platform. The model produces robust target discrimination across a biologically plausible range of target sizes and a range of velocities. Finally, the output of the model for small target motion detection is highly correlated to the velocity of the stimulus but not other background statistics, such as local brightness or contrast, which normally influence target detection tasks.

Original languageEnglish
Title of host publicationInternational Conference on Bio-Inspired Computing
Subtitle of host publicationTheories and Applications, BICTA 2008
Pages109-116
Number of pages8
DOIs
Publication statusPublished - Sep 2008
Externally publishedYes
Event2008 3rd International Conference on Bio-Inspired Computing: Theories and Applications, BICTA 2008 - Adelaide, NT, Australia
Duration: 28 Sep 20081 Oct 2008

Publication series

Name2008 3rd International Conference on Bio-Inspired Computing: Theories and Applications, BICTA 2008

Conference

Conference2008 3rd International Conference on Bio-Inspired Computing: Theories and Applications, BICTA 2008
CountryAustralia
CityAdelaide, NT
Period28/09/081/10/08

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