TY - JOUR
T1 - Joint Optimal Object Shape Estimation and Encoding
AU - Kondi, Lisimachos P.
AU - Melnikov, Gerry
AU - Katsaggelos, Aggelos K.
N1 - Funding Information:
Manuscript received July 8, 2002; revised September 25, 2003. The work of A. K. Katsaggelos was supported in part by the Motorola Center for Communications. An earlier version of this paper was presented at the SPIE Conference of Visual Communications and Image Processing, January 1998 and the International Conference of Image Processing, 2001. This paper was recommended by Associate Editor R. Lancini.
PY - 2004/4
Y1 - 2004/4
N2 - A major problem in object-oriented video coding and MPEG-4 is the encoding of object boundaries. Traditionally this problem is treated separately from the texture encoding problem. In this paper, we present a vertex-based shape coding method which is optimal in the operational rate-distortion sense and takes into account the texture information of the video frames. This is accomplished by utilizing a variable-width tolerance band whose width is a function of the texture profile. As an example, this width is inversely proportional to the magnitude of the image gradient. Thus, in areas where the confidence in the estimation of the boundary is low and/or coding errors in the boundary will not affect the application (e.g., object-oriented coding and MPEG-4) significantly, a larger boundary approximation error is allowed. We present experimental results which demonstrate the effectiveness of the proposed algorithm.
AB - A major problem in object-oriented video coding and MPEG-4 is the encoding of object boundaries. Traditionally this problem is treated separately from the texture encoding problem. In this paper, we present a vertex-based shape coding method which is optimal in the operational rate-distortion sense and takes into account the texture information of the video frames. This is accomplished by utilizing a variable-width tolerance band whose width is a function of the texture profile. As an example, this width is inversely proportional to the magnitude of the image gradient. Thus, in areas where the confidence in the estimation of the boundary is low and/or coding errors in the boundary will not affect the application (e.g., object-oriented coding and MPEG-4) significantly, a larger boundary approximation error is allowed. We present experimental results which demonstrate the effectiveness of the proposed algorithm.
KW - Boundary coding
KW - MPEG-4
KW - Operational rate-distortion (ORD) theory
KW - Shape coding
KW - Shape-adaptive DCT
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U2 - 10.1109/TCSVT.2004.825569
DO - 10.1109/TCSVT.2004.825569
M3 - Article
AN - SCOPUS:2042469464
VL - 14
SP - 528
EP - 533
JO - IEEE Transactions on Circuits and Systems for Video Technology
JF - IEEE Transactions on Circuits and Systems for Video Technology
SN - 1051-8215
IS - 4
ER -