http://hdl.handle.net/2117/3952 2013-05-20T19:29:32Z http://hdl.handle.net/2117/18198 Title: Optical Data Encryption. Supplements Authors: Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet 2013-03-12T08:33:05Z 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. 2012-06-09T10:47:59Z 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. 2012-04-19T12:02:39Z http://hdl.handle.net/2117/15384 Title: Sustainable technologies for water treatment Authors: Morató Farreras, Jordi; Pires Carneiro, Alex; Ortiz Balderas, María de los Ángeles; Gallegos, Ángel 2012-02-27T15:49:18Z http://hdl.handle.net/2117/12561 Title: Camera-based colour measurement Authors: Vilaseca Ricart, Meritxell; Pujol Ramo, Jaume; Martínez Verdú, Francisco Miguel; Chorro, Elisabeth; Perales, Esther 2011-05-13T10:09:32Z