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New dynamic enhancements to the Vertex-Based rate-distortion optimal shape coding framework

Sohel, F.A., Dooley, L.S. and Karmakar, G.C. (2007) New dynamic enhancements to the Vertex-Based rate-distortion optimal shape coding framework. IEEE Transactions on Circuits and Systems for Video Technology, 17 (10). pp. 1408-1413.

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Existing vertex-based operational rate-distortion (ORD) optimal shape coding algorithms use a vertex band around the shape boundary as the source of candidate control points (CP) usually in combination with a tolerance band (TB) and sliding window (SW) arrangement, as their distortion measuring technique. These algorithms however, employ a fixed vertex-band width irrespective of the shape and admissible distortion (AD), so the full bit-rate reduction potential is not fulfilled. Moreover, despite the causal impact of the SW-length upon both the bit-rate and computational-speed, there is no formal mechanism for determining the most suitable SW-length. This paper introduces the concept of a variable width admissible CP band and new adaptive SW-length selection strategy to address these issues. The presented quantitative and qualitative results analysis endorses the superior performance achieved by integrating these enhancements into the existing vertex-based ORD optimal algorithms.

Item Type: Journal Article
Publisher: IEEE
Copyright: © 2007 IEEE
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