A. Ortega

Publications
Influence

The emerging field of signal processing on graphs: Extending high-dimensional data analysis to networks and other irregular domains

D. Shuman, S. Narang, P. Frossard, A. Ortega, P. Vandergheynst
Mathematics, Computer Science
IEEE Signal Processing Magazine
31 October 2012

In applications such as social, energy, transportation, sensor, and neuronal networks, high-dimensional data naturally reside on the vertices of weighted graphs. Expand

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Graph Signal Processing: Overview, Challenges, and Applications

A. Ortega, P. Frossard, J. Kovacevic, J. Moura, P. Vandergheynst
Computer Science, Engineering
Proceedings of the IEEE
1 December 2017

Research in graph signal processing (GSP) aims to develop tools for processing data defined on irregular graph domains. Expand

Rate-distortion methods for image and video compression

A. Ortega, K. Ramchandran
Computer Science
IEEE Signal Process. Mag.
1 November 1998

In this article we provide an overview of rate-distortion (R-D) based optimization techniques and their practical application to image and video coding. Expand

Perfect Reconstruction Two-Channel Wavelet Filter Banks for Graph Structured Data

S. Narang, A. Ortega
Mathematics, Computer Science
IEEE Transactions on Signal Processing
18 June 2011

We propose the construction of two-channel wavelet filter banks for analyzing functions defined on the vertices of any arbitrary finite weighted undirected graph. Expand

Bit allocation for dependent quantization with applications to multiresolution and MPEG video coders

K. Ramchandran, A. Ortega, M. Vetterli
Mathematics, Computer Science
IEEE Trans. Image Process.
1 September 1994

We address the problem of efficient bit allocation in a dependent coding environment. Expand

Efficient Sampling Set Selection for Bandlimited Graph Signals Using Graph Spectral Proxies

Aamir Anis, Akshay Gadde, A. Ortega
Mathematics, Computer Science
IEEE Transactions on Signal Processing
1 October 2015

We study the problem of selecting the best sampling set for bandlimited reconstruction of signals on graphs. Expand

Graph Learning From Data Under Laplacian and Structural Constraints

Hilmi E. Egilmez, Eduardo Pavez, A. Ortega
Mathematics, Computer Science
IEEE Journal of Selected Topics in Signal…
16 November 2016

We propose a novel framework for learning/estimating graphs from data and propose efficient block-coordinate descent algorithms. Expand

Compact Support Biorthogonal Wavelet Filterbanks for Arbitrary Undirected Graphs

S. Narang, A. Ortega
Mathematics, Computer Science
IEEE Transactions on Signal Processing
30 October 2012

This paper extends previous results on wavelet filterbanks for data defined on graphs from the case of orthogonal transforms to more general and flexible biorthogonal transform. Expand

Bit-rate control using piecewise approximated rate-distortion characteristics

L. Lin, A. Ortega
Computer Science
IEEE Trans. Circuits Syst. Video Technol.
1 August 1998

We propose two methods which provide successive reductions in complexity by: (1) using models to interpolate rate and distortion characteristics, and (2) using past frames instead of current ones to determine the models. Expand

VBR video: tradeoffs and potentials

T. V. Lakshman, A. Ortega, A. Reibman
Computer Science
1 May 1998

The authors examine the transport and storage of video compressed with a variable bit rate (VBR). Expand

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