Results 1 to 10 of about 132 (78)

Microsaccades, Drifts, Hopf Bundle and Neurogeometry [PDF]

Journal of Imaging, 2022
The first part of the paper contains a short review of the image processing in early vision is static, when the eyes and the stimulus are stable, and in dynamics, when the eyes participate in fixation eye movements.
Dmitri Alekseevsky
exaly   +7 more sources

Good Continuation in 3D: The Neurogeometry of Stereo Vision [PDF]

Frontiers in Computer Science, 2011
Classical good continuation for image curves is based on 2D position and orientation. It is supported by the columnar organization of cortex, by psychophysical experiments, and by rich models of (differential) geometry.
Steven W Zucker, Giovanna Citti, Alessandro Sarti   +2 more
exaly   +10 more sources

Multi-Frequency Image Completion via a Biologically-Inspired Sub-Riemannian Model with Frequency and Phase [PDF]

Journal of Imaging, 2021
We present a novel cortically-inspired image completion algorithm. It uses five-dimensional sub-Riemannian cortical geometry, modeling the orientation, spatial frequency and phase-selective behavior of the cells in the visual cortex.
Emre Baspinar
doaj   +2 more sources

Neurogeometry of V1 and Kanizsa Contours [PDF]

Axiomathes, 2003
We present a neuro-geometrical model for generating the shape of Kanizsa's modal subjective contours which is based on the functional architecture of the primary areas of the visual cortex. We focus on V1 and its pinwheel structure and model it as a discrete approximation of a continuous fibration π: R × P → P with base space the space of the retina R ...
Miolane, Nina, Pennec, Xavier
core   +7 more sources

Individuation of 3D Perceptual Units From Neurogeometry of Binocular Cells [PDF]

SIAM Journal on Imaging Sciences
We model the functional architecture of the early stages of three-dimensional vision by extending the neurogeometric sub-Riemannian model for stereo-vision introduced in \cite{BCSZ23}. A new framework for correspondence is introduced that integrates a neural-based algorithm to achieve stereo correspondence locally while, simultaneously, organizing the ...
Steven W Zucker, Giovanna Citti
exaly   +5 more sources

A sub-Riemannian model of the motor cortex with Wasserstein distance [PDF]

Frontiers in Computational Neuroscience
This study aims to better understand the functional geometry of the motor cortex, starting from different sources of experimental evidence. Recent studies have proved that cells of the primary motor cortex (M1) are sensitive to short hand trajectories ...
Jawad Ali, Giovanna Citti, Alessandro Sarti   +2 more
doaj   +2 more sources

Reconstructing the population activity of olfactory output neurons that innervate identifiable processing units [PDF]

Frontiers in Neural Circuits, 2008
We investigated the functional organization of the moth antennal lobe (AL), the primary olfactory network, using in vivo electrophysiological recordings and anatomical identification.
Shigehiro Namiki, Shigehiro Namiki, Shigehiro Namiki, Ryohei Kanzaki, Ryohei Kanzaki   +4 more
doaj   +2 more sources

Neurogeometry of Perception: Isotropic and Anisotropic Aspects [PDF]

Axiomathes, 2019
In this paper we first recall the definition of geometical model of the visual cortex, focusing in particular on the geometrical properties of horizontal cortical connectivity. Then we recognize that histograms of edges - co-occurrences are not isotropic distributed, and are strongly biased in horizontal and vertical directions of the stimulus. Finally
Citti, G, Sarti, A
openaire   +5 more sources

Geometry of the visual cortex with applications to image inpainting and enhancement

Graphical Models
Equipping the rototranslation group SE(2) with a sub-Riemannian structure inspired by the visual cortex V1, we propose algorithms for image inpainting and enhancement based on hypoelliptic diffusion. We innovate on previous implementations of the methods
Francesco Ballerin, Erlend Grong
doaj   +1 more source

Neurogeometry of reaching [PDF]

Neurogéométrie du reaching L'objectif de la thèse est de développer un modèle pour le comportement fonctionnel des neurones du cortex moteur primaire (M1) responsables des mouvements d'atteinte du bras. A partir des données neurophysiologiques de Georgopoulos, nous fournissons une première structure de fibré compatible avec l ...
openaire   +2 more sources