1. An apparatus for providing image sensing, the apparatus comprising: a pixel array having a plurality of pixels arranged in two dimensions, wherein: input sensed by each pixel of the plurality of pixels results in a value associated with each pixel, each pixel of the plurality of pixels is configured to be periodically evaluated at a frame rate, and each pixel of the plurality of pixels comprises at least one output that is indicative of whether the value associated with each pixel has changed beyond a threshold level since a previous evaluation of the pixel.