Evaluating the Suitability of Feature Detectors for Automatic Image Orientation Systems

Authors:
Timo Dickscheid;Wolfgang Förstner
Affiliations:
Department of Photogrammetry, Institute of Geodesy and Geoinformation, University of Bonn,;Department of Photogrammetry, Institute of Geodesy and Geoinformation, University of Bonn,
Venue:
ICVS '09 Proceedings of the 7th International Conference on Computer Vision Systems: Computer Vision Systems
Year:
2009

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Abstract

We investigate the suitability of different local feature detectors for the task of automatic image orientation under different scene texturings. Building on an existing system for image orientation, we vary the applied operators while keeping the strategy fixed, and evaluate the results. An emphasis is put on the effect of combining detectors for calibrating difficult datasets. Besides some of the most popular scale and affine invariant detectors available, we include two recently proposed operators in the setup: A scale invariant junction detector and a scale invariant detector based on the local entropy of image patches. After describing the system, we present a detailed performance analysis of the different operators on a number of image datasets. We both analyze ground-truth-deviations and results of a final bundle adjustment, including observations, 3D object points and camera poses. The paper concludes with hints on the suitability of the different combinations of detectors, and an assessment of the potential of such automatic orientation procedures.