Antonio Tabernero

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Gabor schemes of multiscale image representation are useful in many computer vision applications. However, the classic Gabor expansion is computationally expensive due to the lack of orthogonality of Gabor functions. Some alternative schemes, based on the application of a bank of Gabor filters, have important advantages such as computational efficiency and(More)
Rafael Navarro Instituto de Optica "Daza de Valdés" (CSIC). Serrano 121. 28006 Madrid. Spain Phone #: (341) 561 6800; FAX: (341) 564 5557 E-mail: rafa@pixar.optica.csic.es Antonio Tabernero Facultad de Informática. Universidad Politécnica de Madrid. Boadilla del Monte. 28660 Madrid. Spain. Phone #: (341) 336 6935; FAX: (341) 336 6942 E-mail:(More)
In this paper, we study the result of applying a lowpass variant filtering using scaling-rotating kernels to both the spatial and spatial-frequency representations of a two-dimensional (2-D) signal (image). It is shown that if we apply this transformation to a Fourier pair, the two resulting signals can also form a Fourier pair when the filters used in each(More)
In this work we demonstrate the relationship existing between two important issues in vision: multi-scale local spectrum analysis, and log-polar foveatization. We show that, when applying a continuous set of self-similar (rotated and scaled) band-pass lters to estimate the local spectrum at a given point of attention of the image, the inverse Fourier(More)
Discovering microalgae strains containing a high lipid yield and adequate fatty acid composition is becoming a crucial fact in algae-oil factories. In this study, two unknown strains, named Scenedesmus abundans and Chlorella ellipsoidea, have been tested for their response to different nitrogen sources, in order to determine its influence in the production(More)
In this work we demonstrate the relationship existing between two important issues in vision: multi-scale local spectrum analysis, and log-polar foveatization. We show that, when applying a continuous set of self-similar (rotated and scaled) band-pass filters to estimate the local spectrum at a given point of attention of the image, the inverse Fourier(More)
In this paper we study the local spectrum of a signal and its corresponding representation in the time/space domain, what we call the local signal. The local spectrum at the origin is interpreted as a low-pass variant ltering of the Fourier transform of the signal, and we show that, when self-similar scaled lters are used, the same relationship exists(More)
Gabor schemes of multiscale image representation are useful in many computer vision applications. However, the classic Gabor expansion is computationally expensive due to the lack of orthogonality of Gabor functions. Some alternative schemes, based on the application of a bank of Gabor filters, have important advantages such as computational efficiency and(More)
New drug delivery systems (DDSs) with levan or its carboxymethylated form, as carriers, and 5-fluorouracil as a drug, are produced in this work. Levan is obtained after cultivating A. nectaris and polymer nanoparticles are created in water by a self-assembled process. The effect of pH and the ionic strength on polymer nanoparticles aggregation is studied.(More)
BACKGROUND Levan has been traditionally produced from microorganism. However, there is a continuous effort in looking for new strains that improve levan production yield and uses alternative sugar sources for growth. Despite having a wide range of data about levan yield, there are not papers which allow controlling molecular weight, and that plays an(More)