http://hdl.handle.net/2117/3393 Thu, 23 May 2013 11:20:27 GMT 2013-05-23T11:20:27Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/18415 Title: Efectos de la elección del conjunto de entrenamiento en la reconstrucción de firmas espectrales con dispositivo CCD Authors: Gor, Sergio; Sandoval, José; Vilaseca Ricart, Meritxell Tue, 19 Mar 2013 15:50:03 GMT http://hdl.handle.net/2117/18415 2013-03-19T15:50:03Z Gor, Sergio; Sandoval, José; Vilaseca Ricart, Meritxell no http://hdl.handle.net/2117/18334 Title: One-shot focusing using the entropy as a merit function Authors: Suc, Vicent; Royo Royo, Santiago; Jordan, Andres; Bakos, G.; Penev, K. Fri, 15 Mar 2013 09:45:27 GMT http://hdl.handle.net/2117/18334 2013-03-15T09:45:27Z Suc, Vicent; Royo Royo, Santiago; Jordan, Andres; Bakos, G.; Penev, K. no http://hdl.handle.net/2117/18179 Title: Strategy to obtain initial configurations for free form reflectors design Authors: Tomás Corominas, Núria; Arasa Marti, Jose Mon, 11 Mar 2013 15:14:03 GMT http://hdl.handle.net/2117/18179 2013-03-11T15:14:03Z Tomás Corominas, Núria; Arasa Marti, Jose no http://hdl.handle.net/2117/17842 Title: Comparison of B-spline and Zernike fitting techniques in complex wavefront surfaces Authors: Ares Rodríguez, Miguel; Royo Royo, Santiago; Caum Aregay, Jesús; Pizarro Bondia, Carlos Editor: Osten, Wolfgang; Gorecki, Christophe; Novak, Erik L. Mon, 18 Feb 2013 14:47:58 GMT http://hdl.handle.net/2117/17842 2013-02-18T14:47:58Z Ares Rodríguez, Miguel; Royo Royo, Santiago; Caum Aregay, Jesús; Pizarro Bondia, Carlos no http://hdl.handle.net/2117/17831 Title: Application of matched digital filters to noisy fringe-patterns from complex wavefronts Authors: Caum Aregay, Jesús; Arasa Marti, Jose; Royo Royo, Santiago; Ares Rodríguez, Miguel Editor: Osten, Wolfgang; Gorecki, Christophe; Novak, Erik L. Mon, 18 Feb 2013 13:23:04 GMT http://hdl.handle.net/2117/17831 2013-02-18T13:23:04Z Caum Aregay, Jesús; Arasa Marti, Jose; Royo Royo, Santiago; Ares Rodríguez, Miguel no http://hdl.handle.net/2117/17443 Title: Measuring the accommodative response with a double-pass system: Comparison with the Hartmann-Shack technique Authors: Aldaba Arévalo, Mikel; Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume Mon, 21 Jan 2013 15:11:53 GMT http://hdl.handle.net/2117/17443 2013-01-21T15:11:53Z Aldaba Arévalo, Mikel; Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume no http://hdl.handle.net/2117/17436 Title: Analysis and control of speckle effects in self-mixing interferometry Authors: Atashkhooei, Reza; Royo Royo, Santiago; Azcona Guerrero, Francisco Javier; Zabit, U Mon, 21 Jan 2013 13:26:57 GMT http://hdl.handle.net/2117/17436 2013-01-21T13:26:57Z Atashkhooei, Reza; Royo Royo, Santiago; Azcona Guerrero, Francisco Javier; Zabit, U no http://hdl.handle.net/2117/17187 Title: Iris color evaluation through multispectral systems Authors: Herrera Ramírez, Jorge Alexis; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Arjona Carbonell, Mª Montserrat; de Lasarte, Marta Fri, 21 Dec 2012 18:36:41 GMT http://hdl.handle.net/2117/17187 2012-12-21T18:36:41Z Herrera Ramírez, Jorge Alexis; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Arjona Carbonell, Mª Montserrat; de Lasarte, Marta no http://hdl.handle.net/2117/15996 Title: Spectral signatures : a way to identify species and conditions of vegetables Authors: Sandoval, José; Gor, Sergio; Ramallo, Jacqueline; Sfer, Ana; Colombo, Elisa; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume Abstract: Confirming the statement from Shlens (2009), that is, that the goal of PCA is to identify the most meaningful basis to reexpress a dataset, the results obtained in this work show that the careful selection and suitable preparation of samples together with the precise collection of spectral signature data and the application of an adequate statistical analysis like PCA conform a powerful and reliable technique to recognize and classify plants, allowing us to identify the origin of a given vegetable sample. That technique could be considerably improved by developing a database of standardized spectral signatures of the main crops in each stage and status. This could be the basis for higher level of plant and crop analysis, allowing us the prediction, diagnosis, and solution of different health and phenologic affections of plants. Sat, 09 Jun 2012 10:47:59 GMT http://hdl.handle.net/2117/15996 2012-06-09T10:47:59Z Sandoval, José; Gor, Sergio; Ramallo, Jacqueline; Sfer, Ana; Colombo, Elisa; Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume no Confirming the statement from Shlens (2009), that is, that the goal of PCA is to identify the most meaningful basis to reexpress a dataset, the results obtained in this work show that the careful selection and suitable preparation of samples together with the precise collection of spectral signature data and the application of an adequate statistical analysis like PCA conform a powerful and reliable technique to recognize and classify plants, allowing us to identify the origin of a given vegetable sample. That technique could be considerably improved by developing a database of standardized spectral signatures of the main crops in each stage and status. This could be the basis for higher level of plant and crop analysis, allowing us the prediction, diagnosis, and solution of different health and phenologic affections of plants. http://hdl.handle.net/2117/15748 Title: Optics of astigmatism and retinal image quality Authors: Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Luque, Sergio Oscar; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume Abstract: In the first part of this chapter, the optical condition of astigmatism is defined. The main causes and available classifications of ocular astigmatism are briefly described. The most relevant optical properties of image formation in an astigmatic eye are analysed and compared to that of an emmetropic eye and an eye with spherical ametropia. The spectacle prescription and axis notation for astigmatism are introduced, and the correction of astigmatism by means of lenses is briefly described. The formation of the retinal image for extended objects and the related blurring are also analysed, and the real limits of tolerance of uncorrected astigmatism are provided. Simulations of retinal images in astigmatic eyes, obtained by means of commercial optical design software, are also presented. Finally, the clinical assessment of retinal image quality by means of wavefront aberrometry and double-pass systems in eyes with astigmatism is presented, and current trends in research related to this topic are highlighted. Thu, 19 Apr 2012 12:02:39 GMT http://hdl.handle.net/2117/15748 2012-04-19T12:02:39Z Vilaseca Ricart, Meritxell; Díaz-Doutón, Fernando; Luque, Sergio Oscar; Aldaba Arévalo, Mikel; Arjona Carbonell, Mª Montserrat; Pujol Ramo, Jaume no In the first part of this chapter, the optical condition of astigmatism is defined. The main causes and available classifications of ocular astigmatism are briefly described. The most relevant optical properties of image formation in an astigmatic eye are analysed and compared to that of an emmetropic eye and an eye with spherical ametropia. The spectacle prescription and axis notation for astigmatism are introduced, and the correction of astigmatism by means of lenses is briefly described. The formation of the retinal image for extended objects and the related blurring are also analysed, and the real limits of tolerance of uncorrected astigmatism are provided. Simulations of retinal images in astigmatic eyes, obtained by means of commercial optical design software, are also presented. Finally, the clinical assessment of retinal image quality by means of wavefront aberrometry and double-pass systems in eyes with astigmatism is presented, and current trends in research related to this topic are highlighted. http://hdl.handle.net/2117/15038 Title: Measure of roughness of paper using speckle Authors: Pino, Abdiel; Pladellorens Mallofré, Josep Thu, 09 Feb 2012 15:02:59 GMT http://hdl.handle.net/2117/15038 2012-02-09T15:02:59Z Pino, Abdiel; Pladellorens Mallofré, Josep no http://hdl.handle.net/2117/14635 Title: Determinación de propiedades superficiales del papel utilizando el análisis de la textura del patrón de speckle Authors: Pladellorens Mallofré, Josep Wed, 18 Jan 2012 10:20:20 GMT http://hdl.handle.net/2117/14635 2012-01-18T10:20:20Z Pladellorens Mallofré, Josep no http://hdl.handle.net/2117/14553 Title: Optical quality after myopic photorefractive keratectomy and laser in situ keratomileusis: Comparison using a double-pass system Authors: Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Montasell, Ana; Cardona Torradeflot, Genís; Güell, José L.; Pujol Ramo, Jaume Mon, 16 Jan 2012 10:22:55 GMT http://hdl.handle.net/2117/14553 2012-01-16T10:22:55Z Ondategui Parra, Juan Carlos; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Montasell, Ana; Cardona Torradeflot, Genís; Güell, José L.; Pujol Ramo, Jaume no http://hdl.handle.net/2117/14446 Title: Use of light-emitting diodes in multispectral systems design: variability of spectral power distribution according to angle and time of usage Authors: Martínez, Oscar; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Pizarro Bondia, Carlos; Pujol Ramo, Jaume Abstract: Multispectral systems allow the spectral and color characterization of objects using images obtained from several acquisition channels with different spectral sensitivities. Light sources based on light-emitting diodes have started to be used in multispectral systems, mainly to develop low-cost devices for the industry. In this study, the authors examine the variability of spectral power distribution according to the viewing angle of white and single color light-emitting diodes, which can have a significant impact on spectral and color accuracy. This must be taken into account if they are to be used in multispectral systems design. The spectrum drift according to the time of usage of white light-emitting diodes is also analyzed. Tue, 10 Jan 2012 12:07:34 GMT http://hdl.handle.net/2117/14446 2012-01-10T12:07:34Z Martínez, Oscar; Vilaseca Ricart, Meritxell; Arjona Carbonell, Mª Montserrat; Pizarro Bondia, Carlos; Pujol Ramo, Jaume no Multispectral systems allow the spectral and color characterization of objects using images obtained from several acquisition channels with different spectral sensitivities. Light sources based on light-emitting diodes have started to be used in multispectral systems, mainly to develop low-cost devices for the industry. In this study, the authors examine the variability of spectral power distribution according to the viewing angle of white and single color light-emitting diodes, which can have a significant impact on spectral and color accuracy. This must be taken into account if they are to be used in multispectral systems design. The spectrum drift according to the time of usage of white light-emitting diodes is also analyzed. http://hdl.handle.net/2117/13908 Title: Stray-light correction of in-water array spectroradiometers. Effects on underwater optical measurements Authors: Torrecilla Ribalta, Elena; Pons, Sergi; Vilaseca Ricart, Meritxell; Piera, Jaume; Pujol Ramo, Jaume Tue, 15 Nov 2011 13:23:35 GMT http://hdl.handle.net/2117/13908 2011-11-15T13:23:35Z Torrecilla Ribalta, Elena; Pons, Sergi; Vilaseca Ricart, Meritxell; Piera, Jaume; Pujol Ramo, Jaume no