92. The computer-readable storage medium of claim 90 , further comprising computer program instructions for adding another video frame as a second reference frame containing an estimated ROI, wherein the estimated ROI has a similarity score exceeding a threshold value.
90. The computer-readable storage medium of claim 86 , wherein the computer program instructions for refining the estimated motion parameters of the object comprise computer program instructions for: selecting a plurality of candidate ROIs based on a local search centered around estimated position of the ROI; applying a similarity measure to the plurality of candidate ROIs of the object; and selecting at least one ROI based on the similarity measure.