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Featured researches published by Jae-Won Chung.


Signal Processing-image Communication | 2000

A new vertex-based binary shape coder for high coding efficiency

Jae-Won Chung; Jin-Hak Lee; Joohee Moon; Jae-Kyoon Kim

Abstract This paper proposes a new vertex-based binary shape intra coding scheme that generates a set of vertices reducing shape reconstruction error and efficiently encodes the vertices. The conventional vertex-based coding scheme uses the iterated refinement method (IRM) for vertex selection and the object-adaptive vertex encoding (OAVE) for vertex transmission. In the proposed scheme, we introduce a vertex adjustment method to be applied to the vertices selected by the IRM. The vertex adjustment method significantly reduces the reconstruction error of binary shapes. For efficient transmission of vertices, we also propose 1D vertex detection, vertex reordering and initial vertex encoding methods. Furthermore, a conditional differential chain coding is presented for efficient lossless coding of contours. Experimental results show that the proposed vertex-based intra coding scheme reduces coded bits by 17–29% compared with the conventional vertex-based coding scheme, and by up to 27% compared with the intra coding mode of the context-based arithmetic encoding (CAE) scheme of the MPEG-4 Video Verification Model.


Archive | 1995

Object-by shape information compression apparatus and method and coding method between motion picture compensation frames

Jae-Won Chung; Jin-Hak Lee; Joo-Hee Moon; Jae-Kyoon Kim


Archive | 1996

Method of determining coding type and coding mode for object shape coding

Jae-Kyoon Kim; Jae-Won Chung; Kwang-Hoon Park; Joo-Hee Moon; Ji-Heon Kwen


Archive | 1998

Object-based coding and decoding apparatuses and methods for image signals

Sung Moon Chun; Jin Hak Lee; Joo Hee Moon; Gwang-Hoon Park; Jae Kyoon Kim; Jae-Won Chung


Electronics Letters | 1998

Conditional differential chain coding for lossless representation of object contour

Jae-Won Chung; Joo-Hee Moon; Jae-Kyoon Kim


Archive | 1997

System and method for contour-based motion estimation

Jae-Won Chung; Cheol-Soo Park; Joo-Hee Moon; Jae-Kyoon Kim


Archive | 1998

Method and apparatus for coding/decoding scalable shapes by using scan interleaving

Jong-Deuk Kim; Sung-Moon Chun; Jae-Won Chung; Joo-Hee Moon


Electronics Letters | 1999

Optimal vertex adjustment method using a Viterbi algorithm for vertex-based shape coding

Jin-Hak Lee; Jae-Won Chung; Jae-Kyoon Kim


Journal of the Institute of Electronics Engineers of Korea | 2002

Adaptive 1-D Transforms Order Selection Methods for Performance Improvement of SA-DCT

Joon-Ho Song; Joo-Hee Moon; Jae-Won Chung


Archive | 1998

Method and apparatus for scalable coding/decoding of shapes by using scan interleaving

Sung-Moon Chun; Jae-Won Chung; Jong-Deuk Kim; Joo-Hee Moon

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