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Detecting Keypoints with Stable Position, Orientation, and Scale under Illumination Changes

  • Bill Triggs
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3024)

Abstract

Local feature approaches to vision geometry and object recognition are based on selecting and matching sparse sets of visually salient image points, known as ‘keypoints’ or ‘points of interest’. Their performance depends critically on the accuracy and reliability with which corresponding keypoints can be found in subsequent images. Among the many existing keypoint selection criteria, the popular Förstner-Harris approach explicitly targets geometric stability, defining keypoints to be points that have locally maximal self-matching precision under translational least squares template matching. However, many applications require stability in orientation and scale as well as in position. Detecting translational keypoints and verifying orientation/scale behaviour post hoc is suboptimal, and can be misleading when different motion variables interact. We give a more principled formulation, based on extending the Förstner-Harris approach to general motion models and robust template matching. We also incorporate a simple local appearance model to ensure good resistance to the most common illumination variations. We illustrate the resulting methods and quantify their performance on test images.

Keywords

keypoint point of interest corner detection feature based vision Förstner-Harris detector template matching vision geometry object recognition 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • Bill Triggs
    • 1
  1. 1.GRAVIR-CNRS-INRIAMontbonnotFrance

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