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.
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. 91. The computer-readable storage medium of claim 90 , wherein the similarity measure is chosen from a group of sum of absolute difference, mean squared error and normalized correlation coefficient, and the selected ROI optimizes the similarity measure among the plurality of candidate ROIs.