An optimal shape encoding scheme using skeleton decomposition

—This paper presents an operational rate-distortion (ORD) optimal approach for skeleton-based boundary encoding. The boundary information is first decomposed into skeleton and distance signals, by which a more efficient representation of the original boundary results. Curves of arbitrary order are utilized for approximating the skeleton and distance signals. For a given bit budget for a video frame, we solve the problem of choosing the number and location of the control points for all skeleton and distance signals and for all boundaries within a frame, so that the overall distortion is minimized. The problem is solved with the use of Lagrangian relaxation and a shortest path algorithm in a 4D directed acyclic graph (DAG) we propose. By defining a path selection pattern, we reduce the computational complexity of the 4D DAG shortest path algorithm from O(N5 ) to O(N4 ), where N is the number of admissible control points for a skeleton. A suboptimal solution is also presented for furthe...

• Type: Conference
• Year: 2002
• Where: IEEEMSP
• Authors: Haohong Wang, Guido M. Schuster, Aggelos K. Katsaggelos, Thrasyvoulos N. Pappas
• Keywords: Distance Signals, IEEEMSP 2002, Multimedia, Shortest Path Algorithm, Skeleton