1. Within a digital acquisition device with an adjustable optical system having an auto focusing mechanism, a method of enhancing auto focus based on detection and tracking of a region of interest, the method comprising: identifying a first group of pixels that includes a region of interest within a digital image including determining a degree of focus of said first group of pixels; determining an adjusted value of degree of focus for the first group of pixels; tracking the region of interest within a stream of digital images; detecting that the focus position of the region of interest has changed based on movement between the digital image and a subsequent image within the stream of digital images; and automatically adjusting focus position based upon the adjusted value of degree of focus and upon the detecting that the focus position of the region of interest has changed based on said movement.