A number of proposals use this technique to improve prediction. The approach where a larger memory is used is helpful not only to improve the prediction accuracy but also to allow advanced user interaction, e.g. the user can travel in the scene pulling is own scene script. Usage of object memory . This is a generalisation of the background memory concept, that can be used if a layered representation of the image is considered. Polygon tessellation of the image .
Some proposals use non-rectangular block representation models.
Thus the motion estimation and compensation procedures must be adapted to them. For the non-feature points, the motion vectors are obtained by interpolating the feature points motion vectors. Warping prediction of triangular patches . The image is represented by a grid of triangular patches, allowing motion estimation by simply using the grid nodes motion vectors. Compensation is done using warping prediction.