Resumo

GONZALEZ GOMEZ, Andrés Leonardo; MENESES FONSECA, Jaime Enrique; BALLESTEROS DIAZ, Alexánder  e  LEON TELLEZ, Jaury. Method to the extraction of control points based to the phase estimate of a coded dot pattern for camera calibration. Iteckne [online]. 2013, vol.10, n.1, pp.7-15. ISSN 1692-1798.

Inspired by Zhang's method on camera calibration, a phase based approach to the estimation of features points is proposed. The proposed method requires a pseudo periodic pattern of equispaced black dots that mathematically can be represented by two orthogonal fringe systems. Due to regular distribution, control point positions are obtained with subpixel accuracy from their phase distributions. The correspondences between 3D control points and their resulting image positions are realized without user intervention. This is possible because the control points in the pattern have their positions encrypted with a pseudorandom binary sequence. Experiments have shown that phase based procedure for extracting control point positions is much more robust to noise than intensity based approach.

Palavras-chave : Camera calibration; phase extraction; Fourier Transform.

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