Virtual Retina is under CeCILL C licence: APP logiciel Virtual Retina: IDDN.FR.OO1.210034.000.S.P.2007.000.31235
Virtual Retina is a simulation software, fully described in [Oops!] , [Oops!] , that allows large-scale simulations of biologically-plausible retinas, with customizable parameters, and different possible biological features:
Spatio-temporal linear filter implementing the basic Center/Surround organization of retinal filtering.
Non-linear Contrast Gain Control mechanism providing instantaneous adaptation to the local level of contrast. This stage is modelled as a dynamic shunting feedback by amacrine cells onto bipolar cells; the resulting model reproduces contrast-dependent amplitude and phase non-linearities, as measured in real mammalian retinas by Shapley & Victor 78.
Spike generation by one or several layers of ganglion cells paving the visual field. Magnocellular and Parvocellular pathways can be modelled in the same framework according to the parameters chosen. Large-scale simulations can be pursued on up to 100,000 spiking cells.
Possibility of a global radial inhomogeneity modeling the foveated organisation of mammalian retinas. In this case, the spatial scales of filtering, and the density of spiking cells, both depend on the eccentricity from the center of the retina.
Possibility to include a basic microsaccades generator at the input of the retina, to account for fixational eye movements.
This work was partially supported by the EC IP project FP6-015879, FACETS. To learn more, please visit the web page http://www-sop.inria.fr/odyssee/team/Adrien.Wohrer/retina/index.html