Visual Classification of Coarse Vehicle Orientation using Histogram of Oriented Gradients Features

Paul Rybski, Daniel Huber, Daniel D. Morris, and Regis Hoffman
2010 IEEE Intelligent Vehicles Symposium, July, 2010.


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Abstract
For an autonomous vehicle, detecting and tracking other vehicles is a critical task. Determining the orientation of a detected vehicle is necessary for assessing whether the vehicle is a potential hazard. If a detected vehicle is moving, the orientation can be inferred from its trajectory, but if the vehicle is stationary, the orientation must be determined directly. In this paper, we focus on vision-based algorithms for determining vehicle orientation of vehicles in images. We train a set of Histogram of Oriented Gradients (HOG) classifiers to recognize different orientations of vehicles detected in imagery. We find that these orientation-specific classifiers perform well, achieving a 88% classification accuracy on a test database of 284 images. We also investigate how combinations of orientation- specific classifiers can be employed to distinguish subsets of orientations, such as driver's side versus passenger's side views. Finally, we compare a vehicle detector formed from orientation- specific classifiers to an orientation-independent classifier and find that, counter-intuitively, the orientation-independent clas- sifier outperforms the set of orientation-specific classifiers.

Notes
Sponsor: Army Research Lab
Associated Center(s) / Consortia: Vision and Autonomous Systems Center and Field Robotics Center
Associated Project(s): CTA Robotics
Number of pages: 8

Text Reference
Paul Rybski, Daniel Huber, Daniel D. Morris, and Regis Hoffman, "Visual Classification of Coarse Vehicle Orientation using Histogram of Oriented Gradients Features ," 2010 IEEE Intelligent Vehicles Symposium, July, 2010.

BibTeX Reference
@inproceedings{Rybski_2010_6599,
   author = "Paul Rybski and Daniel Huber and Daniel D. Morris and Regis Hoffman",
   title = "Visual Classification of Coarse Vehicle Orientation using Histogram of Oriented Gradients Features ",
   booktitle = "2010 IEEE Intelligent Vehicles Symposium",
   month = "July",
   year = "2010",
}