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. 2021 Sep 23;17(9):e1009383. doi: 10.1371/journal.pcbi.1009383

Fig 2. Model visual system.

Fig 2

A. Map of the 1296 (48x27) elementary units composing the visual system. The visual span is fully panoramic (360°) on the azimuth and 81° upward on the elevation. The red framed visual unit is the one used as example in B. B. Elementary visual unit process. Each unit acts as a orientation-free edge detector. The comparison of the summed intensity of the left vs the right of the unit and of the top vs the bottom gives an index from 0 (no difference ↔ no edge) to 1 (corner edge) for each unit.