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Conference Papers Year : 2012

Adaptive Structure from Motion with a contrario model estimation

Abstract

Structure from Motion (SfM) algorithms take as input multi-view stereo images (along with internal calibration information) and yield a 3D point cloud and camera orientations/poses in a common 3D coordinate system. In the case of an incremental SfM pipeline, the process requires repeated model estimations based on detected feature points: homography, fundamental and essential matrices, as well as camera poses. These estimations have a crucial impact on the quality of 3D reconstruction. We propose to improve these estimations using the a contrario methodology. While SfM pipelines usually have globally-fixed thresholds for model estimation, the a contrario principle adapts thresholds to the input data and for each model estimation. Our experiments show that adaptive thresholds reach a significantly better precision. Additionally, the user is free from having to guess thresholds or to optimistically rely on default values. There are also cases where a globally-fixed threshold policy, whatever the threshold value is, cannot provide the best accuracy, contrary to an adaptive threshold policy.
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Dates and versions

hal-00769266 , version 1 (30-12-2012)

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Pierre Moulon, Pascal Monasse, Renaud Marlet. Adaptive Structure from Motion with a contrario model estimation. ACCV 2012, Nov 2012, Daejeon, South Korea. pp.257-270, ⟨10.1007/978-3-642-37447-0_20⟩. ⟨hal-00769266⟩
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