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A two-dimensional visual tracking array

The density and concurrency available in VLSI make it an excellent technology 
for implementing visual image-processing. By incorporating phototransistors 
and analog processing elements onto a single die, the large signal 
bandwidths required for real-time computations can be achieved. This 
paper describes a VLSI chip that computes the "center of intensity" of a 
two-dimensional visual field. One application for this network is the localization 
of a bright spot of light against a dark background. Theoretical and 
experimental results are presented to describe the operation of the system 
and its suitability as a input device for tracking servo systems.