Shape error concealment using hermite splines

Guido M. Schuster*, Xiaohuan Li, Aggelos K. Katsaggelos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The introduction of video objects (VOs) is one of the innovations of MPEG-4. The α-plane of a VO defines its shape at a given instance in time and hence determines the boundary of its texture. In packet-based networks, shape, motion, and texture are subject to loss. While there has been considerable attention paid to the concealment of texture and motion errors, little has been done in the field of shape error concealment. In this paper, we propose a post-processing shape error-concealment technique that uses geometric boundary information of the received α-plane. Second-order Hermite splines are used to model the received boundary in the neighboring blocks, while third order Hermite splines are used to model the missing boundary. The velocities of these splines are matched at the boundary point closest to the missing block. There exists the possibility of multiple concealing splines per group of lost boundary parts. Therefore, we draw every concealment spline combination that does not self-intersect and keep all possible results until the end. At the end, we select the concealment solution that results in one closed boundary. Experimental results demonstrating the performance of the proposed method and comparisons with prior proposed methods are presented.

Original languageEnglish (US)
Pages (from-to)808-820
Number of pages13
JournalIEEE Transactions on Image Processing
Issue number6
StatePublished - Jun 1 2004


  • Error concealment
  • Hermite spline
  • MPEG-4
  • Shape coding

ASJC Scopus subject areas

  • Software
  • Computer Graphics and Computer-Aided Design


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