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- Lisimachos P. Kondi, Gerry Melnikov, Aggelos K. Katsaggelos
- IEEE Transactions on Circuits and Systems forâ€¦
- 2004

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, weâ€¦ (More)

- Gerry Melnikov, Guido M. Schuster, Aggelos K. Katsaggelos
- IEEE Trans. Circuits Syst. Video Techn.
- 2000

This paper investigates ways to explore the between frame correlation of shape information within the framework of an operationally rate-distortion (ORD) optimized coder. Contours are approximatedâ€¦ (More)

A major problem in object oriented video coding and MPEG-4 is the encoding of object boundanes. Traditionally, and within MPEG-4, the encoding of shape and texture information are separate steps (theâ€¦ (More)

- Gerry Melnikov, Aggelos K. Katsaggelos
- IEEE Trans. Multimedia
- 2002

In this paper a hybrid fractal and Discrete Cosine transform (DCT) coder is developed. Drawing on the ability of DCT to remove inter-pixel redundancies and on the ability of fractal transforms toâ€¦ (More)

- Guido M. Schuster, Gerry Melnikov, Aggelos K. Katsaggelos
- IEEE Trans. Multimedia
- 1999

In this paper, we review a general framework for the optimal bit allocation among dependent quantizers based on the minimum maximum (MINMAX) distortion criterion. Pros and cons of this optimizationâ€¦ (More)

- Ranveig Nygaard, Gerry Melnikov, Aggelos K. Katsaggelos
- IEEE Transactions on Biomedical Engineering
- 2001

Signal compression is an important problem encountered in many applications. Various techniques have been proposed over the years for addressing the problem. Here, the authors present a time domainâ€¦ (More)

This paper describes e cient and optimal encoding and representation of object contours. Contours are approximated by connected second-order spline segments, each de ned by three consecutive controlâ€¦ (More)

- Gerry Melnikov, Guido M. Schuster, Aggelos K. Katsaggelos
- ICASSP
- 1999

This paper investigates the problem of optimal lossy encoding of object contours in the Inter mode. Contours are approximated by connected second-order spline segments, each defined by threeâ€¦ (More)

- Gerry Melnikov, Aggelos K. Katsaggelos
- ICASSP
- 2000

In this paper, we present a rate-distortion (RD) optimized scalable vertex-based shape coding algorithm. Following the base layer, each successive enhancement layer re nes a given shape approximationâ€¦ (More)

- Gerry Melnikov, Aggelos K. Katsaggelos
- ICIP
- 2000

This paper presents an e cient recursive algorithm for generating operationally optimal intra mode scalable layer decompositions of object contours. The problem is posed in terms of minimizing theâ€¦ (More)