A system for vehicle recognition in video based on SIFT features, mixture models, and support vector machines

Abhikesh Nag, David J. Miller, Andrew P. Brown, Kevin J. Sullivan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We present a system for scale and affine invariant recognition of vehicular objects in video sequences. We use local descriptors (SIFT keypoints) from image frames to model the object. These features are claimed in the literature to be highly distinctive and invariant to rotation, scale, and affine transformations. However, since the SIFT keypoints that are extracted from an object are instance-specific (variable), they form a dynamic feature space. This presents certain challenges for classification techniques, which generally require use of the same set of features for every instance of an object to be classified. To resolve this difficulty, we associate the extracted keypoints to the components (representative keypoints) in a mixture model for each target class. While the extracted keypoints are variable, the mixture components are fixed. The mixture models the keypoint features, as well as the location and scale at which each keypoint was detected in the frame. Keypoint to component association is achieved via a switching optimization procedure that locally maximizes the joint likelihood of keypoints and their locations and scales with the latter based on an affine transformation. To each mixture component from a class, we link a (first layer) support vector machine (SVM) classifier which votes for or against the hypothesis that the keypoint associated to the component belongs to the model's target class. A second layer SVM pools the votes from the ensemble of SVM classifiers in the first layer and gives the final class decision. We show promising results of experiments for video sequences from the VIVID database.

Original languageEnglish (US)
Title of host publicationIntelligent Computing
Subtitle of host publicationTheory and Applications V
StatePublished - 2007
EventIntelligent Computing: Theory and Applications V - Orlando, FL, United States
Duration: Apr 9 2007Apr 10 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherIntelligent Computing: Theory and Applications V
Country/TerritoryUnited States
CityOrlando, FL

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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