Beyond ℓ1 sparse coding in V1
Fig 6
Sampling of RFs of different aspect ratios from our thresholding algorithms and recordings on macaques’ V1 and V2.
A: Sampling of RFs generated by CEL0. As we go down the rows their aspect ratio (defined as the width (SD) of the Gaussian envelope parallel to the axis of the Gabor over the width orthogonal to it) increases. The same RF organization applies to the rest of the Figures. B: RFs generated by ISTA. C: RF subunits from electrophysiological recordings in V1. D: Same as (C) for V2 (data courtesy of Liang She).