Analog MOS network for temporal and spatial contrast detection based on invertebrate vision systems and an optic flow sensitive network

摘要

A biological model of vision systems in the lateral eye of limulus was implemented into a simple analog network. The vision system can extract temporal and spatial contrasts from visual scenes. The local signals of temporal and spatial contrasts at each ommatidium, which is a unit element of the lateral eye, are formed by using self-inhibition and lateral inhibition from neighbors, respectively. Simulation results using SPICE showed that the implemented network detected temporal and spatial contrasts expected from the model. The detection of temporal and spatial contrasts is a primitive function in early visual processing. Therefore, the implemented network has the potential to be a basic component of various visual preprocessors. In conclusion, we examined the construction method of an optic-flow sensitive network base on the implemented network and biological direction-selective neurons.