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Improved Sub-pixel Stereo Correspondences through Symmetric Refinement
International Conference on Computer Vision (ICCV), October 2005

Diego Nehab, Szymon Rusinkiewicz, James Davis



Rendering of 3D scan obtained using active temporal stereo with
(left) traditional and (right) our symmetric subpixel refinement strategies.

Abstract

Most dense stereo correspondence algorithms start by establishing discrete pixel matches and later refine these matches to sub-pixel precision. Traditional sub-pixel refinement methods attempt to determine the precise location of points, in the secondary image, that correspond to discrete positions in the reference image. We show that this strategy can lead to a systematic bias associated with the violation of the symmetry of matching cost functions. This bias produces random or coherent noise in the final reconstruction, but can be avoided by refining both image coordinates simultaneously, in a symmetric way. We demonstrate that the symmetric sub-pixel refinement strategy results in more accurate correspondences by avoiding bias while preserving detail.

Citation (BibTeX)

Diego Nehab, Szymon Rusinkiewicz, and James Davis. Improved Sub-pixel Stereo Correspondences through Symmetric Refinement. International Conference on Computer Vision (ICCV), October 2005.

Paper
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