title: Estimation of depth fields suitable for video compression based on 3-D structure and motion of objects.
abstract: Intensity prediction along motion trajectories removes temporal redundancy considerably in video compression algorithms. In three-dimensional (3-D) object-based video coding, both 3-D motion and depth values are required for temporal prediction. The required 3-D motion parameters for each object are found by the correspondence-based E-matrix method. The estimation of the correspondences-two-dimensional (2-D) motion field-between the frames and segmentation of the scene into objects are achieved simultaneously by minimizing a Gibbs energy. The depth field is estimated by jointly minimizing a defined distortion and bit-rate criterion using the 3-D motion parameters. The resulting depth field is efficient in the rate-distortion sense. Bit-rate values corresponding to the lossless encoding of the resultant depth fields are obtained using predictive coding; prediction errors are encoded by a Lempel-Ziv algorithm. The results are satisfactory for real-life video scenes.
authors.affiliation: Department of Electrical and Electronics Engineering, Bilkent University, TR-06533 Ankara, Turkey. alatan@ee.bilkent.edu.tr
authors.forename: A A
authors.initials: AA
authors.lastname: Alatan
authors.forename: L
authors.initials: L
authors.lastname: Onural