A system processing a stream of input data ordered row by row from a data array has a first integrated circuit (IC) adapted to apply an aperture function to the stream of input data, to produce an output data stream, and a second IC coupled to the first IC, the second IC adapted to manage context from row to row, retaining partial values as computed by the aperture function for each column along a row, and providing the partial values back to the aperture function for subsequent rows as needed to complete output values.