Certain embodiments of the methods and systems disclosed herein determine a location of a tracked object with respect to a coordinate system of a sensor array by using analog signals from sensors having overlapping nonlinear responses. Hyperacuity and real time tracking are achieved by either digital or analog processing of the sensor signals. Multiple sensor arrays can be configured in a plane, on a hemisphere or other complex surface to act as a single sensor or to provide a wide field of view and zooming capabilities of the sensor array. Other embodiments use the processing methods to adjust to contrast reversals between an image and the background.