Self-Clustering Symmetry Detection

Bei HE  Guijin WANG  Chenbo SHI  Xuanwu YIN  Bo LIU  Xinggang LIN  

IEICE TRANSACTIONS on Information and Systems   Vol.E95-D   No.9   pp.2359-2362
Publication Date: 2012/09/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E95.D.2359
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Image Recognition, Computer Vision
symmetry detection,  feature extraction,  feature pair selection,  iterative self-clustering,  

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This paper presents a self-clustering algorithm to detect symmetry in images. We combine correlations of orientations, scales and descriptors as a triple feature vector to evaluate each feature pair while low confidence pairs are regarded as outliers and removed. Additionally, all confident pairs are preserved to extract potential symmetries since one feature point may be shared by different pairs. Further, each feature pair forms one cluster and is merged and split iteratively based on the continuity in the Cartesian and concentration in the polar coordinates. Pseudo symmetric axes and outlier midpoints are eliminated during the process. Experiments demonstrate the robustness and accuracy of our algorithm visually and quantitatively.