log-gabor

Open Science

To enable the dissemination of the knowledge that is produced in our lab, we share all source code with open source licences. This includes code to reproduce results obtained in papers (e.g. (Perrinet, Adams and Friston, 2015), (Perrinet and Bednar, 2015), (Khoei et, 2017), (Perrinet, 2019) or courses and slides (e.g. 2019-04-03_a_course_on_vision_and_modelization, 2019-04-18_JNLF, …) and also the development of the following libraries on GitHub. Follow @laurentperrinet bayesianchangepoint An implementation of Adams & MacKay 2007 “Bayesian Online Changepoint Detection” in Python.

Motion Clouds: Model-based stimulus synthesis of natural-like random textures for the study of motion perception

Choosing an appropriate set of stimuli is essential to characterize the response of a sensory system to a particular functional dimension, such as the eye movement following the motion of a visual scene. Here, we describe a framework to generate …

Self-Invertible 2D Log-Gabor Wavelets

Meanwhile biorthogonal wavelets got a very popular image processing tool, alternative multiresolution transforms have been proposed for solving some of their drawbacks, namely the poor selectivity in orientation and the lack of translation in- …

Sparse Approximation of Images Inspired from the Functional Architecture of the Primary Visual Areas

Modeling of simple cells through a sparse overcomplete gabor wavelet representation based on local inhibition and facilitation

We present a biologically plausible model of simple cortical cells as 1) a linear transform representing edges and 2) a non-linear iterative stage of inhibition and facilitation between neighboring coefficients. The linear transform is a complex …

Sparse Gabor wavelets by local operations

Efficient sparse coding of overcomplete transforms remains still anopen problem. Different methods have been proposed in theliterature, but most of them are limited by a heavy computationalcost and by difficulties to find the optimal solutions. We …