Research Interests

  1. Compressed sensing
  2. Numerical optimization
  3. Seismic imaging
  4. High dynamic range (HDR) image and video coding
  5. Scalable video compression (SVC) and transmission
  6. Stereo imaging

News Updates

July 10, 2013: Talk on the modified nonlocal hard-thresholding (mNLHT) algorithm presented at SPARS 2013 available here. Attendant test code is available at the following links: [demo function and test code].


May 16, 2013: Tech. report on a fast randomized Kaczmarz algorithm for finding sparse solutions to linear systems available here.


February 8, 2013: I will be joining the Multimedia Group of Mitsubishi Electric Research Laboratories on March 1st, 2013.


August 15, 2012: Talk motivating and describing the WSPGL1 algorithm is now available from here.


June 4, 2012: The WSPGL1 code is now available for download. [code page]


Invited Talks

"Reweighted algorithms for sparse signal recovery," MIT Media Lab, Cambridge, MA, May 2013. [pdf]

"Beyond $\ell_1$ minimization for sparse signal recovery," Alberta - BC Meeting on Applied Harmonic Analysis, Vancouver, BC, August 2012. [pdf]

"Weighted $\ell_1$ minimization: support recovery guarantees and an iterative algorithm," Applied Harmonic Analysis and Multiscale Computing (AHAMC), Edmonton, Alberta, July 2011. [pdf]

"Weighted $\ell_1$ minimization: Stability, robustness, and some implications," Banff Workshop on Sparse and Low Rank Approximation, Banff - Alberta, March 2011. [pdf]

"Recovery of Compressively Sampled Signals Using Partial Support Information," Canadian Mathematical Society Winter Meeting, Vancouver - BC, December 2010. [pdf]
  *I gave extended versions of this talk at Simon Fraser University in November 2010 and Caltech in October 2010. [pdf]

About Me

My research interests include the analysis, development, and application of sparse signal reconstruction algorithms for distorted and compressively sampled image and video signals which share common support bases. In particular, I am interested in the development of convex relaxations for the recovery of jointly sparse signals, such as the color spaces in images and the temporally dependent frames in video signals.

My PhD research was focused on the compression, modeling, and transmission of scalable video content (SVC). Topics covered multi-user wireless video transmission, backward-compatible high dynamic range (HDR) video compression, and generation of HDR content from multiple exposure low dynamic range (LDR) content.

In January 2010 I joined Dr. Ozgur Yilmaz and Dr. Michael Friedlander as a post-doctoral research fellow with the Departments of Mathematics and Computer Science at the University of British Columbia.
I hold a PhD degree in Electrical and Computer Engineering at UBC (August 2009) under the supervision of Dr. Panos Nasiopoulos and Dr. Vikram Krishnamurthy.
I also hold a Master of Applied Science degree in Electrical and Computer Engineering from UBC (2005) and a Bachelor of Engineering degree in computer and communications engineering from the American University of Beirut (AUB) (2003).