1. A device, comprising: an imaging subsystem for generating image data; a first memory component for storing an input frame of image data; and a processor configured for: receiving the input frame from the first memory component; combining information from two or more pixels in the input frame to generate a pixel in a reduced resolution frame having fewer pixels than the input frame; attempting to identify, in the reduced resolution frame, transition pairs having differences between the pixels in the pair that exceed a pixel transition threshold; and attempting to identify, in the reduced resolution frame, a linear feature between two or more identified transition pairs.