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3D Visual Phrases for Landmark Recognition
Qiang Hao, Rui Cai, Zhiwei Li, Lei Zhang, Yanwei Pang, Feng Wu Tianjin University, Tianjin , P.R. China Microsoft Research Asia, Beijing , P.R. China
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Outline Introduction 3D Visual Phrase Discovery
3D Visual Phrase Description 3D Visual Phrase Detection Evaluation Conclusion and Future Work
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Introduction Most existing work(BoW)
features extracted from irrelevant objects treats the database images independently A 3D visual phrase is a triangular facet on the surface of a reconstructed 3D landmark model. explicitly characterize the spatial structure of a 3D object highly robust to projective transformations due to viewpoint changes.
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Introduction
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3D Visual Phrase Discovery
3D Landmark Reconstruction 3D Point Selection 3D Visual Phrase Generation Multi-Scale 3D Visual Phrases
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3D Visual Phrase Discovery
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Multi-Scale 3D Visual Phrases
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3D Visual Phrase Description
Visual Appearance Geometric Structure
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Visual Appearance
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Geometric Structure
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3D Visual Phrase Detection
Appearance-based Point Matching Geometry-based Intra-Phrase Ranking Graph-based Inter-Phrase Refinement
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3D Visual Phrase Detection
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Evaluation
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Evaluation
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Evaluation
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Evaluation
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Conclusion and Future Work
In contrast to 2D visual phrases defined in 2D image planes, 3D visual phrases are derived from the physical space and explicitly characterize the 3D spatial structure of a landmark Highly robust to viewpoint changes. Geometric constraintsare desired to afford to more relaxed point matching Accelerate the algorithms, especially the point matching step.
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