We presentananalogVLSI cellulararchitectureimplementinga simplifiedversionof theBoundaryContourSystem(BCS)for real-timeimage processing.Inspiredby neuromorphicmodelsacrossseveral layersof visual cortex, the designintegratesin eachpixel the functionsof simple cells,complex cells,hyper-complex cells,andbipole cells, in three orientationsinterconnectedon a hexagonalgrid. Analog current-mode CMOScircuitsareusedthroughouto performedgedetection,localinhibition,directionallyselecti velong… CONTINUE READING
Figure 4: Simplified circuit schematic of one BCS cell in the hexagonal array, showing only one of three directions, the other directions being symmetrical in implementation. (a) Photosensor and random-access input selection circuit. (b) Simple cell rectified gradient calculation. (c) Complex cell spatial and orientational inhibition. (d) Bipole cell directional long range cooperation. (e) Bipole global gain and threshold control.