Near-optimal combination of disparity across a log-polar scaled visual field.
Journal
PLoS computational biology
ISSN: 1553-7358
Titre abrégé: PLoS Comput Biol
Pays: United States
ID NLM: 101238922
Informations de publication
Date de publication:
04 2020
04 2020
Historique:
received:
26
03
2019
accepted:
30
01
2020
revised:
22
04
2020
pubmed:
11
4
2020
medline:
21
7
2020
entrez:
11
4
2020
Statut:
epublish
Résumé
The human visual system is foveated: we can see fine spatial details in central vision, whereas resolution is poor in our peripheral visual field, and this loss of resolution follows an approximately logarithmic decrease. Additionally, our brain organizes visual input in polar coordinates. Therefore, the image projection occurring between retina and primary visual cortex can be mathematically described by the log-polar transform. Here, we test and model how this space-variant visual processing affects how we process binocular disparity, a key component of human depth perception. We observe that the fovea preferentially processes disparities at fine spatial scales, whereas the visual periphery is tuned for coarse spatial scales, in line with the naturally occurring distributions of depths and disparities in the real-world. We further show that the visual system integrates disparity information across the visual field, in a near-optimal fashion. We develop a foveated, log-polar model that mimics the processing of depth information in primary visual cortex and that can process disparity directly in the cortical domain representation. This model takes real images as input and recreates the observed topography of human disparity sensitivity. Our findings support the notion that our foveated, binocular visual system has been moulded by the statistics of our visual environment.
Identifiants
pubmed: 32275711
doi: 10.1371/journal.pcbi.1007699
pii: PCOMPBIOL-D-19-00488
pmc: PMC7176150
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e1007699Subventions
Organisme : NEI NIH HHS
ID : R01 EY029713
Pays : United States
Déclaration de conflit d'intérêts
The authors have declared that no competing interests exist.
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