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Group Member

David

David Liu

PhD. Candidate

Personal Homepage: http://dliu.cmu.googlepages.com

Email: dliu@cmu.edu

Office: PH B23
Lab: Porter Hall B6
Phone: 412-268-1171 (Office)

Fax: 412-268-1679

Mailing Address:
Porter Hall B23, CMU ECE

5000 Forbes Avenue

Pittsburgh, PA 15213

[Research Interests] [Project] [Publications]

Research Interests

Currently working on Object Detection/Recognition [Download papers (CVPR_BP) (ICASSP) (ICIP)]

My text detection system received the most accurate results in a recent VACE evaluation.

My recent interest is on Markov Random Field (MRF), probabilistic Latent Semantic Analysis (PLSA) and the Semantic-Shift algorithm.

Presentation slides on PLSA

Presentation slides on Semantic-Shift

Video demos accompanying the Semantic-Shift presentation slides [ 1 ] [ 2 ] [ 3 ]

Shape Matching based on Shape Context and ICP

The shape context method can be integrated into the iterative closest point (ICP) method as an auxiliary feature vector, enriching the representation of an image point from spatial information only, to spatial and shape information. This yields a registration method more robust than the original ICP method. The method is general for 2D shapes. It does not calculate derivatives, hence being able to handle shapes with junctions and discontinuities.

		ICP Final translation error 6.3 pixels Final rotation error 7.5 degrees
		ICP with soft shape context Final translation error 1.6 pixels Final rotation error 1.8 degrees
		ICP Final translation error 8.2 pixels Final rotation error 6.1 degrees
		ICP with soft shape context Final translation error 0.2 pixels Final rotation error 5.7 degrees

Probabilistic Relevance Feedback for Image Retrieval

More can be found at the probabilistic relevance feedback link.

Content-Free Image Retrieval [Download paper (pdf)]

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Projects

Content-based Image Retrieval

For details on the project please see the trademark retrieval project and the probabilistic relevance feedback project.

Object Detection and Recognition

The discovery website is up.

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Publications

Journal Papers:

· D. Liu and T. Chen, "DISCOV: A Framework for Discovering Objects in Video", IEEE Transactions on Multimedia, 2008.

· C.M. Huang, D. Liu and Li-Chen Fu, "Visual Tracking in Cluttered Environment Using the Visual Probabilistic Data Association Filter", IEEE Transactions on Robotics, 2006.

Conference Papers:

D. Liu and T. Chen, "Unsupervised Image Categorization and Object Localization using Topic Models and Correspondences between Images ", IEEE International Conference on Computer Vision, 2007.
D. Liu and T. Chen, "A Topic-Motion Model for Unsupervised Video Object Discovery (Poster)", IEEE Conference on Computer Vision and Pattern Recognition, 2007.
D. Liu and T. Chen, "Background Cutout with Automatic Object Discovery (Poster)", IEEE International Conference on Image Processing, 2007.
D. Liu and T. Chen, "Semantic-Shift for Unsupervised Object Detection", (PPT slides), Workshop on Beyond Patches, in conjunction with CVPR, 2006.

D. Liu, D. Chen, and T. Chen, "Latent Layout Analysis for Discovering Objects in Images", IEEE International Conference on Pattern Recognition, 2006.

D. Liu, D. Chen, and T. Chen, "Unsupervised Image Layout Extraction", IEEE International Conference on Image Processing, 2006.

D. Liu and T. Chen, "Content-Free Image Retrieval using Bayesian Product Rule", IEEE International Conference on Multimedia & Expo, 2006.

D. Liu and T. Chen, "Object Detection in Video with Graphical Models", IEEE International Conference on Acoustics, Speech, and Signal Processing, 2006.

D. Liu, Simon Lucey, Datong Chen and T. Chen, "Addressing the Tunnel Vision Problem in Object Detection", AMP Tech Report, 2005.

D. Liu and T. Chen, "Probabilistic relevance feedback for image retrieval with binary feature vectors", IEEE Conference on Acoustics, Speech, and Signal Processing, 2005.
D. Liu and Tsuhan Chen, "Soft shape context for iterative closest point registration", IEEE International Conference on Image Processing, 2004.
D. Liu, L.C. Fu, S.H. Hsu, T.K. Kuo, "Analysis on an On-Line Iterative Correction Control Law for Visual Tracking", Asian Control Conference, 2002.
D. Liu, L.C. Fu, "Target Tracking in an Environment of Nearly Stationary and Biased Clutter", IEEE International Conference on Intelligent Robots and Systems, 2001.
D. Liu, L.C. Fu, T.K. Kuo, J.W. Yeh, "PDA Filter Based on the Winner-Update Strategy for Visual Tracking", Chinese Automatic Control Conference 2001 (Best paper award)
W.G. Yau, L.C. Fu, D. Liu, "Design and Implementation of a Visual Servoing System for Realistic Air Target Tracking", IEEE International Conference on Robotics & Automation, 2001.
W.G. Yau, Li-Chen Fu, D. Liu, "Robust Real-time 3D Trajectory Tracking Algorithms for Visual Tracking Using Weak Perspective Projection", American Control Conference, 2001.

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