RT Journal Article
T1 A new radial symmetry measure applied to photogrammetry
A1 Dosil Lago, Raquel
A1 Pardo López, Xosé Manuel
A1 Fernández Vidal, Xosé Ramón
A1 Leborán, Víctor
A1 García Díaz, Antón
K1 Circular coded targets
K1 Radial symmetry
K1 Filter banks
K1 Log Gabor
K1 Target identification
K1 Correlation
AB This work presents a new measure for radial symmetry and an algorithm for its computation. This measure identifies radially symmetric blobs as locations with contributions from all orientations at some scale. Hence, at a given scale, radial symmetry is computed as the product of the responses of a set of even symmetric feature detectors, with different orientations. This operator presents low sensitivity to shapes lacking radial symmetry, is robust to noise, contrast changes and strong perspective distortions, and shows a narrow point spread function. A multi-resolution measure is provided, computed as the maximum of the symmetry measure evaluated over a set of scales. We have applied this measure in the field of photogrammetry for the detection of circular coded fiducial targets. The detection of local maxima of multi-resolution radial symmetry is combined with a step of false-positive rejection, based on elliptical model fitting. In our experiments, the efficiency of target detection with this method is improved regarding a well-known commercial system, which is expected to improve the performance of bundle adjustment techniques. In order to fulfill all steps previous to bundle adjustment, we have also developed our own method for recognition of coded targets. This is accomplished by a standard procedure of segmentation and decoding of the ring sequence. Nevertheless, we have included a step for the verification of false positives of decoding based on correlation with reference targets. As far as we know, this approach cannot be found in literature.
PB Springer
SN 1433-7541
YR 2013
FD 2013
LK http://hdl.handle.net/10347/32538
UL http://hdl.handle.net/10347/32538
LA eng
NO Dosil, R., Pardo, X. M., Fdez-Vidal, X. R., García-Díaz, A., & Leborán, V. (2013). A new radial symmetry measure applied to photogrammetry. Pattern Analysis and Applications, 16, 637-646.
NO This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s10044-012-0281-y
NO This work has been developed in the framework of the projects Alexandria (Ref. PSE-020000-2009-10) and DICON (Ref: IPT-2011-1191-020000), funded by the Spanish Ministerio de Ciencia e Innovación, under the programs Proyectos Singulares Estratégicos and INNPACTO respectively. We also acknowledge the Laboratorio Oficial de Metroloxía de Galicia for providing test images and ground truth data.
DS Minerva
RD 28 abr 2026