Vlad I. Morariu

I am a member of the research faculty (assistant research scientist) at the University of Maryland, associated with the Computer Vision Lab and the Institute for Advanced Computer Studies. I received my doctoral degree in Computer Science at the University of Maryland, College Park, with Prof. Larry Davis as my advisor. I completed my B.S. and M.S. degrees at Penn State University with Prof. Octavia Camps as my research advisor.

Research interests: I am interested in high-level commonsense reasoning about the visual world in the face of observation and model uncertainty. Ultimately, I would like to build a system that can answer complex visual queries that are expressed linguistically and are not known ahead of time. This involves investigating knowledge representations that manage the trade-off between expressiveness and computational complexity; learning rich spatial and temporal models while managing the trade-off between the amount of model structure, training data, and supervision; and, reducing uncertainty in mid- and low-level computer vision techniques.

My interests lie at the intersection of computer vision, artificial intelligence, and machine learning. Click on a topic to see related publications: computer vision - event modeling and retrieval, object detection and classification, tracking, action recognition; artificial intelligence - knowledge representation and reasoning, natural language processing; machine learning - large (web-)scale machine learning, graphical models, classification, kernel density estimation.

Publications

Ruichi Yu, Xi Chen, Vlad I. Morariu, Larry S. Davis. The Role of Context Selection in Object Detection. British Machine Vision Conference (BMVC), 2016. [ORAL] PDF BibTeX

Varun K. Nagaraja, Vlad I. Morariu, Larry S. Davis. Modeling Context Between Objects for Referring Expression Understanding. European Conference on Computer Vision (ECCV), 2016. PDF BibTeX Code

Venkataraman Santhanam, Vlad I. Morariu, David Harwood, Larry S. Davis. A Non-parametric Approach to Extending Generic Binary Classifiers for Multi-classification. Pattern Recognition (PR), 2016. PDF BibTeX

Xintong Han, Bharat Singh, Vlad I. Morariu, Larry S. Davis. VRFP: On-the-fly Video Retrieval using Web Images and Fast Fisher Vector Products. arXiv, 2016. PDF BibTeX

Yaming Wang, Jonghyun Choi, Vlad I. Morariu, Larry S. Davis. Mining Discriminative Triplets of Patches for Fine-Grained Classification. IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2016. PDF BibTeX

Ang Li, Vlad I. Morariu, Larry S. Davis. Selective Encoding for Recognizing Unreliably Localized Faces. IEEE International Conference on Computer Vision (ICCV), 2015. PDF BibTeX

Bharat Singh, Xintong Han, Zhe Wu, Vlad I. Morariu, Larry S. Davis. Selecting Relevant Web Trained Concepts for Automated Event Retrieval. IEEE International Conference on Computer Vision (ICCV), 2015. PDF BibTeX

Yen-Liang Lin, Vlad I. Morariu, Winston Hsu. Summarizing While Recording: Context-Based Highlight Detection for Egocentric Videos. IEEE International Conference on Computer Vision Workshops (ICCVW), 2015. PDF BibTeX

Varun K. Nagaraja, Vlad I. Morariu, Larry S. Davis. Searching for Objects using Structure in Indoor Scenes. British Machine Vision Conference (BMVC), 2015. PDF Supplementary BibTeX

Yaming Wang, Vlad I. Morariu, Larry S. Davis. Unsupervised Feature Extraction Inspired by Latent Low-Rank Representation. IEEE Winter Conference on Applications of Computer Vision (WACV), 2015. PDF Appendix BibTeX

Hyungtae Lee, Vlad I. Morariu, Larry S. Davis. Clauselets: Leveraging Temporally Related Actions for Video Event Analysis. IEEE Winter Conference on Applications of Computer Vision (WACV), 2015. PDF BibTeX

Ang Li, Vlad I. Morariu, Larry S. Davis. Planar Structure Matching Under Projective Uncertainty for Geolocation. European Conference on Computer Vision (ECCV), 2014. PDF BibTeX

Yen-Liang Lin, Vlad I. Morariu, Winston Hsu, Larry S. Davis. Jointly Optimizing 3D Model Fitting and Fine-Grained Classification. European Conference on Computer Vision (ECCV), 2014. PDF BibTeX Dataset

Varun K. Nagaraja, Vlad I. Morariu, Larry S. Davis. Feedback Loop between High Level Semantics and Low Level Vision. European Conference on Computer Vision Workshop (ECCVW), 2014. PDF Supplementary BibTeX

Hyungtae Lee, Vlad I. Morariu, Larry S. Davis. Robust Pose Features for Action Recognition. IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW), 2014. PDF BibTeX

Vlad I. Morariu, Ejaz Ahmed, Venkataraman Santhanam, David Harwood, Larry S. Davis. Composite Discriminant Factor Analysis. IEEE Winter Conference on Applications of Computer Vision (WACV), 2014. PDF BibTeX coming soon: [code] [vehicle dataset]

Radu Dondera, Vlad I. Morariu, Yulu Wang, and Larry S. Davis. Interactive Video Segmentation Using Occlusion Boundaries and Temporally Coherent Superpixels. IEEE Winter Conference on Applications of Computer Vision (WACV), 2014. PDF BibTeX

Fatemeh Mirrashed, Vlad I. Morariu, and Larry S. Davis. Sampling for Unsupervised Domain Adaptive Object Detection. IEEE International Conference on Image Processing (ICIP), 2013. PDF BibTeX

Radu Dondera, Vlad I. Morariu, Larry S. Davis. Learning to Detect Carried Objects with Minimal Supervision. IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW), 2013. PDF BibTeX

Vlad I. Morariu, David Harwood, and Larry S. Davis. Tracking People's Hands and Feet Using Mixed Network AND/OR Search. IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), 2013. PDF BibTeX coming soon: [software] [videos]

Fatemeh Mirrashed, Vlad I. Morariu, Behjat Siddiquie, Rogerio S. Feris, and Larry S. Davis. Domain Adaptive Object Detection. IEEE Workshop on the Applications of Computer Vision (WACV), 2013. PDF BibTeX

Hyungtae Lee, Vlad I. Morariu, and Larry S. Davis. Qualitative Pose Estimation by Discriminative Deformable Part Models. Asian Conference on Computer Vision (ACCV), 2012. PDF BibTeX

Sameh Khamis, Vlad I. Morariu, and Larry S. Davis. Combining Per-Frame and Per-Track Cues for Multi-Person Action Recognition. European Conference on Computer Vision (ECCV), 2012. PDF BibTeX Errata

Sameh Khamis, Vlad I. Morariu, and Larry S. Davis. A Flow Model for Joint Action Recognition and Identity Maintenance. IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2012. PDF BibTeX Errata

Ryan Farrell, Om Oza, Ning Zhang, Vlad I. Morariu, Trevor Darrell, and Larry S. Davis. Subordinate Categorization Using Volumetric Primitives and Pose-Normalized Appearance. IEEE International Conference on Computer Vision (ICCV), 2011. [ORAL] PDF BibTeX

Vlad I. Morariu and Larry S. Davis. Multi-agent event recognition in structured scenarios. IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2011. PDF BibTeX Appendix Video

Vlad I. Morariu, Balaji Vasan Srinivasan, Vikas C. Raykar, Ramani Duraiswami, and Larry S. Davis. Automatic online tuning for fast Gaussian summation. Advances in Neural Information Processing Systems (NIPS), 2008. PDF BibTeX

Vlad I. Morariu, V. Shiv Naga Prasad, and Larry S. Davis. Human Activity Understanding using Visibility Context. IEEE/RSJ IROS Workshop: From sensors to human spatial concepts (FS2HSC), 2007. PDF BibTeX

Benjamin Fransen, Vlad Morariu, Eric Martinson, Samuel Blisard, Matthew Marge, Scott Thomas, Alan Schultz, and Dennis Perzanowski. Using Vision, Acoustics, and Natural Language for Disambiguation. IEEE International Conference on Human-Robot Interaction (HRI) 2007. PDF BibTeX

Vlad I. Morariu, Octavia I. Camps, Mario Sznaier, and Hwasup Lim. Robust Cooperative Visual Tracking: A Combined Nonlinear Dimensionality Reduction/Robust Identification Approach. In Advances in Cooperative Control and Optimization, M. Hirsch, R. Murphey, P. Pardalos and D. Grundel, Eds., Springer Verlag, 2007. PDF BibTeX

Vlad I. Morariu and Octavia I. Camps. Modeling Correspondences in Multi-camera Tracking using Nonlinear Manifold Learning and Target Dynamics. IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2006. PDF BibTeX

Hwasup Lim, Vlad I. Morariu, Octavia I. Camps, and Mario Sznaier. Dynamic Appearance Modeling for Human Tracking. IEEE Conference on Computer Vision and Pattern Recognition (CVPR) 2006. PDF BibTeX

Software

FIGTree - Fast Improved Gauss Transform with Tree Data Structure (FIGTree Homepage)
A library for fast computation of Gauss transforms in multiple dimensions, using the Improved Fast Gauss Transform and Approximate Nearest Neighbor searching. The nearest neighbor searching is performed using the ANN library, available at http://www.cs.umd.edu/~mount/ANN/. This software allows for efficient computation of probabilities by Kernel Density Estimation (KDE), and can reduce complexity of algorithms commonly used in Computer Vision, Machine Learning, etc, that must evaluate the Gauss transform. The publication describing the newest improvements in the code is the NIPS 2008 paper by Morariu et al. Previous publications related to this approach are provided on Vikas Raykar's page.