1. A digital video encoder, comprising: a segmentation module configured to segment frames in a digital video sequence into background regions and object regions; and an object parameter generator configured to generate object motion and object appearance parameters based on segmented object regions, the motion parameters defining a location of an object and including at least one motion parameter defining an orientation of a segmented object region with respect to an image wherein, the object regions comprise oriented rectangles and the at least one motion parameter comprises a translation parameter, a scaling parameter and a parameter indicating a difference of an orientation angle between a width axis of the object region and an axis of a bounding box for successive frames in the digital video sequence.