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<p>The detection of edges is only one of many steps in the understanding of images. Further processing necessarily involves grouping operations between contours. We present a representation of edge contours by approximating B-splines and show that such a representation facilitates the extraction of symmetries between contours. Our representation is rich, compact, stable, and does not critically depend on feature extraction. We turn our attention to the detection of three types of symmetries: skew symmetries and parallel symmetries, which have proven to be of great importance in inferring shape from contour, and smooth local symmetries, which have been used for planar shape description. We show that our representation facilitates the computation of these symmetries.</p>
B-spline contour representation; symmetry detection; edge detection; edge contours; skew symmetries; parallel symmetries; shape from contour; smooth local symmetries; planar shape description; image recognition; splines (mathematics)
G. Medioni, H. Rom, P. Saint-Marc, "B-spline Contour Representation and Symmetry Detection", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 15, no. , pp. 1191-1197, November 1993, doi:10.1109/34.244680
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