Coding depth perception from image defocus

•Depth perception is related to chromatic aberration and blur radii.•Spike latency is suggested as a reasonable way of coding depth signals.•Spike latency and shoot velocity have approximate functional relationships. As a result of the spider experiments in Nagata et al. (2012), it was hypothesized...

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Bibliographic Details
Published in:Vision research (Oxford) 2014-12, Vol.105, p.199-203
Main Authors: Supèr, Hans, Romeo, August
Format: Article
Language:English
Subjects:
Animals
Araneae
Chromatic aberration
Cues
Depth from defocus
Depth Perception - physiology
Fixation, Ocular - physiology
Models, Theoretical
Motor Activity - physiology
Predatory Behavior
Spiders - physiology
Spiking model
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Summary:•Depth perception is related to chromatic aberration and blur radii.•Spike latency is suggested as a reasonable way of coding depth signals.•Spike latency and shoot velocity have approximate functional relationships. As a result of the spider experiments in Nagata et al. (2012), it was hypothesized that the depth perception mechanisms of these animals should be based on how much images are defocused. In the present paper, assuming that relative chromatic aberrations or blur radii values are known, we develop a formulation relating the values of these cues to the actual depth distance. Taking into account the form of the resulting signals, we propose the use of latency coding from a spiking neuron obeying Izhikevich’s ‘simple model’. If spider jumps can be viewed as approximately parabolic, some estimates allow for a sensory-motor relation between the time to the first spike and the magnitude of the initial velocity of the jump.
ISSN:0042-6989
1878-5646
DOI:10.1016/j.visres.2014.10.022