1. A method for segmenting an image, comprising the steps of: defining one or more segments from one of a plurality of images; determining one or more unstable segments of the one or more segments changing by more than a predetermined threshold from a prior of the plurality of images; determining one or more transitioning segments transitioning from an unstable to a stable segment; determining depth only for one or more of the one or more unstable segments that have changed by more than the predetermined threshold and for one or more of the one or more transitioning segments; and combining the determined depth for the one or more unstable segments and the one or more transitioning segments with a predetermined depth of all segments changing less than the predetermined threshold, and thus comprising other than the one or more unstable segments and one or more transitioning segments from the prior of the plurality of images.