Beyond ℓ1 sparse coding in V1
Fig 7
Spatial properties of RFs generated by thresholding algorithms and in macaques’ V1 and V2.
A: Width (SD) of the Gaussian envelope along the parallel axis of the Gabor as a function of the width orthogonal to it (both normalized by the Gabor’s period) for the fits of the RFs generated by ISTA and CEL0. B: Same as (A) for CEL0 and an instance of ISTA with the same sparsity level as CEL0 (sparse ISTA). C: Same as (A) for ISTA and an instance of CEL0 with the same sparsity level as ISTA (dense CEL0). D: Same as (A) for the RF subunits from recordings in macaque V1 and V2.