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General Information
Dr. Lin Huang
Metropolitan State University of Denver, USA
It's my honor to take on the position of editor in chief of IJMLC. We encourage authors to submit papers concerning any branch of machine learning and computing.
IJMLC 2015 Vol. 5(3): 214-218 ISSN: 2010-3700
DOI: 10.7763/IJMLC.2015.V5.509

Pedestrian Density Estimation by a Weighted Bag of Visual Words Model

Shilin Zhang and Xunyuan Zhang
Abstract—Pedestrian density estimation is very useful and important under transportation environment. In this paper, we present a novel weighting scheme of “bag of visual words model” for pedestrian density estimation, which characterizes both the weight and the relative spatial arrangement aspects of all visual words in depicting an image. We firstly analyze the visual words generation process. By counting the number of images through which each visual word is clustered and computing the cluster radius of each visual word, we can give each visual word a weight. Specially, the co-occurrences of visual words are computed with respect to spatial predicates over a hierarchical spatial partitioning of an image. The representation captures both the absolute and relative spatial arrangement of the words and, through the choice and combination of the predicates, can characterize a variety of spatial relationships. We validate this hypothesis using a challenging ground truth pedestrian dataset. Our approach is shown to result in higher classification accuracy rates than a non-weighting bag-of-visual-words approach. The time used to generate the visual words of our approach is only 1/20 to 1/30 compared to the time of the traditional image feature cluster process.

Index Terms—Pedestrian detection, spatial relationship, visual words, SIFT.

The authors are with North China University of Technology, Beijing, 100144, China (e-mail: zhangshilin@126.com).


Cite: Shilin Zhang and Xunyuan Zhang, "Pedestrian Density Estimation by a Weighted Bag of Visual Words Model," International Journal of Machine Learning and Computing vol. 5, no. 3, pp. 214-218, 2015.

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