Joint Optimal Object Shape Estimation and Encoding

L.P. Kondi, G. Melnikov, A.K. Katsaggelos
2004 IEEE transactions on circuits and systems for video technology (Print)  
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 (ORD) 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
more » ... 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 (object oriented coding, MPEG-4, etc.) significantly, a larger boundary approximation error is allowed. We present experimental results which demonstrate the effectiveness of the proposed algorithm.
doi:10.1109/tcsvt.2004.825569 fatcat:obhngunpqrhe5kmb332vhkma2q