Body Localization in Still Images Using Hierarchical Models and Hybrid Search

Jiayong Zhang, Jiebo Luo, Robert Collins, and Yanxi Liu
Proceedings of the 2006 IEEE Conference on Computer Vision and Pattern Recognition (CVPR'06), July, 2006, pp. 1536 -- 1543.


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Abstract
We present a 3-level hierarchical model for localizing human bodies in still images from arbitrary viewpoints. We first fit a simple tree-structured model defined on a small landmark set along the body contours by Dynamic Programming (DP). The output is a series of proposal maps that encode the probabilities of partial body configurations. Next, we fit a mixture of view-dependent models by Sequential Monte Carlo (SMC), which handles self-occlusion, anthropometric constraints, and large viewpoint changes. DP and SMC are designed to search in opposite directions such that the DP proposals are utilized effectively to initialize and guide the SMC inference. This hybrid strategy of combining deterministic and stochastic search ensures both the robustness and efficiency of DP, and the accuracy of SMC. Finally, we fit an expanded mixture model with increased landmark density through local optimization. The model hierarchy is trained on a large number of gait images. Extensive tests on cluttered images with varying poses including walking, dancing and various types of sports activities demonstrate the feasibility of the proposed approach.

Notes
Associated Center(s) / Consortia: Vision and Autonomous Systems Center
Number of pages: 8

Text Reference
Jiayong Zhang, Jiebo Luo, Robert Collins, and Yanxi Liu, "Body Localization in Still Images Using Hierarchical Models and Hybrid Search," Proceedings of the 2006 IEEE Conference on Computer Vision and Pattern Recognition (CVPR'06), July, 2006, pp. 1536 -- 1543.

BibTeX Reference
@inproceedings{Zhang_2006_5365,
   author = "Jiayong Zhang and Jiebo Luo and Robert Collins and Yanxi Liu",
   title = "Body Localization in Still Images Using Hierarchical Models and Hybrid Search",
   booktitle = "Proceedings of the 2006 IEEE Conference on Computer Vision and Pattern Recognition (CVPR'06)",
   pages = "1536 -- 1543",
   month = "July",
   year = "2006",
   volume = "II",
}