Sensor matrix array for image processing in visual cortex

A simple architecture of image processing has been developed to imitate the functions of the higher level visual cortex by using the new optoelectronic sensor. This sensor has the characteristics approximated by DOG (difference of Gaussian) functions. The characteristics are due to the negative photoinduced current (PIC) and the negative differential (ND) characteristics according to the forward bias voltage, which have been effectively obtained just for layer structures with a charge-storage layer of InAs/GaAs short period superlattice (SSL). By the simple matrix array using the sensor, the functions of selectivity to orientation angle, motion- direction and length of slit light in visual cortex have been imitated successfully.