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Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Vargas, Javier ; Gómez Pedrero, José Antonio | Spie-Soc Photo-Optical Instrumentation Engineers | 2006-10We present a high-speed 3-D spatiotemporal shape measurement technique by means of structured light. Current methods use a constant number of images that do not take into account the available temporal continuity of the measured object. That is,[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; González Fernández, Luis M. ; Belenguer Dávila, Tomás | Optical Society of America | 2010-06-01We demonstrate a method to calibrate a Shack-Hartmann sensor as an orthographic camera. This calibration method permits us to obtain the distance, the rotation matrix between the microlens array and CCD imaging planes, and the projection matrix,[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier | SPIE--The International Society for Optical Engineering | 2008Reliable inspection of large surfaces with low depth recovery error is needed in a wide variety of industrial applications, for example in external defect inspection in aeronautical surfaces. Active triangulation measurement systems with a rigid[...]texto impreso
Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Alonso Fernández, José ; Vargas, Javier | The Optical Society Of America | 2010-09-20This paper presents a deflectometric technique to measure the power of an ophthalmic lens as perceived by the user. It is based on a calibrated camera acting as a pinhole in order to measure ray deflection along the same path as the visual axis [...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Belenguer Dávila, Tomás | 2010-11-01We demonstrate a method to directly demodulate closed-fringe interferograms using a kind of active contour called a snake. This method can be used to demodulate a single closed-fringe interferogram when its background illumination and/or contras[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Terrón López, M. José | Spie-Soc Photo-Optical Instrumentation Engineers | 2007-02A novel calibration method for whole field three-dimensional shape measurement by means of fringe projection is presented. Standard calibration techniques, polynomial- and model-based, have practical limitations such as the difficulty of measuri[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Estrada, Julio César ; Carazo García, José María ; Sánchez Sorzano, Carlos Óscar | Elsevier Sci. Ltd. | 2013-07Noise is a key problem in fringe pattern processing, especially in single frame demodulation of interferograms. In this work, we propose to filter the pattern noise using a straightforward, fast and easy to implement denoising method, which is b[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Restrepo, R. ; Belenguer Dávila, Tomás | Elsevier Science B. V. | 2011-08-15We demonstrate a method to easily and quickly extend the dynamic range imaging capabilities of the camera in a typical interferometric approach. The camera dynamic range is usually low and limited to 256 gray levels. Also, it is well known that [...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Estrada, Julio C. ; Sánchez Sorzano, Carlos Óscar ; Servín Guirado, Manuel | The Optical Society Of America | 2012-08-20Fringe patterns with a multiplicative phase shift among them appear in experimental techniques as photoelasticity and RGB shadow moiré, among others. These patterns cannot be processed using standard phase-shifting demodulation techniques. In th[...]texto impreso
Active triangulation measurement systems with a rigid geometric configuration are inappropriate tor scanning large objects with low measuring tolerances. The reason is that the ratio between the depth recovery error and the lateral extension is [...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier | Spie-Soc Photo-Optical Instrumentation Engineers | 2008-023-D triangulation measurement systems with a fixed geometrical configuration have practical limitations that make them inappropriate for a wide variety of applications. The reason is that the ratio between the depth recovery error and the latera[...]texto impreso
Quiroga Mellado, Juan Antonio ; Uribe Patarroyo, Néstor R. ; Vargas, Javier ; Álvarez Herrero, Alberto ; Belenguer Dávila, Tomás | The Optical Society Of America | 2010-02-01Liquid crystal variable retarders (LCVRs) are starting to be widely used in optical systems because of their capacity to provide a controlled variable optical retardance between two orthogonal components of incident polarized light or to introdu[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Álvarez Herrero, Alberto ; Belenguer Dávila, Tomás | The Optical Society Of America | 2011-01-17The presence of uncontrolled mechanical vibrations is typically the main precision-limiting factor of a phase-shifting interferometer. We present a method that instead of trying to insolate vibrations; it takes advantage of their presence to pro[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Belenguer Dávila, Tomás | The Optical Society Of America | 2011-04-15An asynchronous phase-shifting method based on principal component analysis (PCA) is presented. No restrictions about the background, modulation, and phase shifts are necessary. The presented method is very fast and needs very low computational [...]texto impreso
Quiroga Mellado, Juan Antonio ; Servín Guirado, Manuel ; Estrada, Julio César ; Vargas, Javier | The Optical Society Of America | 2011-03-14In phase sampling interferometry, existing temporal analysis methods are sensitive to border effects and cannot deal with missing data. In this work we propose a quadrature filter that allows a reliable dynamic phase measurement for every sample[...]
