1. A method for using a capture device to capture a stream of images to produce a video signal corresponding to a particular image scene, comprising: a) providing a two-dimensional image sensor having a plurality of pixels; b) reading a first group of pixels from the image sensor at a first frame rate to produce a first video signal of the particular image scene that is used to produce the video signal; c) while reading the first group of pixels, reading a second group of pixels from the image sensor that are different from the first group of pixels at a second frame rate to produce a second video signal of at least a portion of the particular image scene, wherein the first group of pixels surrounds on all sides the second group of pixels; and d) using the second video signal for adjusting one or more capture device parameters wherein the one or more capture device parameters effect a change in at least the first group of pixels; and e) repeating steps b through d while capturing the stream of images to produce the video signal.