A new adaptive vertex-based binary shape coding technique

Authors:
Chung-Ming Kuo;Chaur-Heh Hsieh;Yong-Ren Huang
Affiliations:
Department of Information Engineering, I-Shou University, Tahsu, Kaohsiung 840, Taiwan;Department of Information Engineering, I-Shou University, Tahsu, Kaohsiung 840, Taiwan;Department of Information Engineering, Shu-Te University, Yen-Chau, Kaohsiung 824, Taiwan
Venue:
Image and Vision Computing
Year:
2007

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Abstract

This paper presents a new adaptive vertex-based coding scheme to improve the coding efficiency of the object shapes of a video sequence. We first smooth out the original contour using the property of perfect 8-connectivity, which reduces the number of vertexes without loss of quality. Then we propose top-down and bottom-up algorithms to select the vertex points. In the top-down scheme, we develop a new adjusting technique to measure the distortion. It is simple for both calculation and implementation, and the reconstructed shape has better quality. In the bottom-up scheme, we develop a new area-based measure that makes the insertion of a new vertex easy. Finally, we propose a scheme that employs multiple dynamic ranges to modify the object-adaptive vertex coding method. It improves the coding performance significantly.