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Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Servín Guirado, Manuel | The Optical Society Of America | 2008-07-20We present a spatial adaptive asynchronous algorithm for fringe pattern demodulation. The proposed algorithm is based on the standard five-step asynchronous method with the one modification that we select the best sample spacing for each point o[...]texto impreso
Quiroga Mellado, Juan Antonio ; Guerrero, J. A. ; Marroquín Zaleta, José Luis ; Rivera Meraz, M. | Optical Society of America | 2005-11-15A technique is presented for filtering and normalizing noisy fringe patterns, which may include closed fringes, so that single-frame demodulation schemes may be successfully applied. It is based on the construction of an adaptive filter as a lin[...]texto impreso
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 ; Gómez Pedrero, José Antonio ; García Botella, Ángel | Elsevier Science BV | 2001-09-15In this work we present a new algorithm for fringe pattern normalization, that is. background suppression and modulation normalization. Normalization is necessary for several fringe pattern processing techniques. For example, this is the case of[...]texto impreso
Quiroga Mellado, Juan Antonio ; Villa Hernández, José de Jesús ; Rodríguez-Vera, Ramón ; Rosa Vargas, José Ismael de la ; González Ramírez, Efrén | Elsevier Sci. Ltd. | 2010-06In our recently reported work [1] (Villa et al., 2009) we derived a regularized quadratic-cost function, which includes fringe orientation information, for denosing fringe pattern images. In this work we adopt such idea for denoising wrapped pha[...]texto impreso
Quiroga Mellado, Juan Antonio ; González Cano, Agustín | SPIE--The International Society for Optical Engineering | 1999In this work we present the application of a regularization algorithm to the processing of photoelastic hinge patterns. The method used is a modified phase tracking algorithm applied to phase-shifted images. In particular, we present an algorith[...]texto impreso
Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Fournier, N. ; Martínez Antón, Juan Carlos | VDI-VDE - Verlag GMBH | 2004Automatic demodulation of single-image fringe patterns is of great importance in research areas were it is difficult to apply standard phase evaluation techniques such as phase sampling or Fourier transform methods. In this work we will present [...]texto impreso
We present a method for automatic determination of isostatics from the photoelastic measurement of isoclinics obtained by phase-shifting techniques. The method is based on the integration of two difference equations by use of a multigrid algorit[...]texto impreso
Quiroga Mellado, Juan Antonio ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1998-09-01An algorithm for accurately extracting the local fringe direction is presented. The algorithm estimates, in the neighborhood of n × n points, the direction of the gradient that points normal to the local fringe direction. The performance of four[...]texto impreso
Quiroga Mellado, Juan Antonio ; Villa Hernández, José de Jesús ; Crespo Vázquez, Daniel | SPIE--The International Society for Optical Engineering | 1999In this work we present two methods for the analysis of moire deflectograms. The first method is a Fourier-transform technique. The second method uses a regularization based method. Both methods are applied to realistic deflectograms and their p[...]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 ; Alonso Fernández, José ; Zoido, J. ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1994-09-10Least-squares approximation can be used in image-based colorimetry once the set of sampling functions is selected. We discuss the accuracy obtained in earlier research, and we compare it with a better calculation method.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 ; Servín Guirado, Manuel ; Cuevas de la Rosa, Francisco Javier | Elsevier Science BV | 2001-12-15First- and second-order recursive Digital Phase Locked Loops (DPLLs) have been used recently in fringe data processing because it is the fastest way to obtain the unwrapped phase of a carrier frequency fringe pattern due to its minimal computati[...]
