1. A method used in object-based video coding for generating sprites from video objects in a video sequence, the method comprising: computing motion parameters that estimate motion of a video object in a current frame relative to a previously constructed sprite; warping the video object into the previously constructed sprite using the motion parameters; and incrementally blending the warped video object with the previously constructed sprite by weighting the previously constructed sprite in proportion to the number of times that the sprite has been updated with a warped video object of a previous frame such that each warped video object in the video sequence provides substantially the same contribution to a final sprite representing the video object throughout a video sequence.