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Extraction of junction signals.

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posted on 15.06.2009, 01:29 by Ulrich Weidenbacher, Heiko Neumann

The figure depicts how local activity from model cells is combined to obtain specific junction maps. To extract a T-junction signal orientation specific V2 bipole cell activities are combined pairwisely with orientation specific V1 end-stop cell activities. Pairs of cells that correspond to same orientations are not considered (diagonal marked with “X”). The combination of cell activities is done multiplicatively such that both cells have to be active in order to produce a response. This can be represented in a map where each entry corresponds to a specific T-junction configuration. X-, and L-junction maps are extracted similarly except that pairwise combination is based on V2 bipole cells (X-junctions) and V1 end-stop cells (L junctions). To summarize, the maps represent information about local image structure with respect to different junction types. Note, that end-stop cells are only indicated for one direction in the figure. However, end-stop cell responses of both directions that correspond to one orientation are additively combined for the extraction of junction maps.

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