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Proceedings Paper

Focus measurement in 3D focal stack using direct and inverse discrete radon transform
Author(s): Óscar Gómez-Cárdenes; José G. Marichal-Hernández; Juan M. Trujillo-Sevilla; David Carmona-Ballester; José M. Rodríguez-Ramos
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Paper Abstract

The discrete Radon transform, DRT, calculates, with linearithmic complexity, the sum of pixels through a set of discrete lines covering all possible slopes and intercepts in an image. In 2006, a method was proposed to compute the inverse DRT that remains exact and fast, in spite of being iterative. In this work the DRT pair is used to propose a Ridgelet and a Curvelet transform that perform focus measurement of an image. Then the shape from focus approach based on DRT pair is applied to a focal stack to create a depth map of a scene.

Paper Details

Date Published: 10 May 2017
PDF: 14 pages
Proc. SPIE 10219, Three-Dimensional Imaging, Visualization, and Display 2017, 102190R (10 May 2017); doi: 10.1117/12.2261921
Show Author Affiliations
Óscar Gómez-Cárdenes, Univ. de La Laguna (Spain)
José G. Marichal-Hernández, Univ. de La Laguna (Spain)
Juan M. Trujillo-Sevilla, Univ. de La Laguna (Spain)
David Carmona-Ballester, Univ. de La Laguna (Spain)
José M. Rodríguez-Ramos, Univ. de La Laguna (Spain)
Wooptix S.L. (Spain)

Published in SPIE Proceedings Vol. 10219:
Three-Dimensional Imaging, Visualization, and Display 2017
Bahram Javidi; Jung-Young Son; Osamu Matoba, Editor(s)

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