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Ezquerro Rodríguez, José Miguel ; Zoido Chamorro, Jesús Manuel ; Perales, Esther ; Martínez Verdú, Francisco M. ; Melgosa Latorre, Manuel | Society for Imaging Science and Technology | 2008-06Given a fixed set of viewing conditions, a colour appearance model provides a method for transforming tristimulus values to perceptual attributes correlates, and vice versa. Current colour appearance models, like C1ECAM02 [1], have been develope[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Vázquez Moliní, Daniel ; Álvarez Fernández-Balbuena, Antonio ; Bernabeu Martínez, Eusebio ; García Botella, Ángel ; Herráenz Ferreiro, Juan Antonio ; Egido Rodríguez, Marian, del | SPIE | 2009-08-22This work is intended to deal with the problems which arise when illuminanting Paleolithic cave paintings. We have carried out the spectral and colorimetric characterization of some paintings located in the Murcielagos (bats) cave (Zuheros, Córd[...]texto impreso
For a system of N Bose atoms, we propose a natural probability distribution for the occupation numbers. The counting statistics only depends on the probabilities of occupation of the single-particle states. Fluctuations of the occupation numbers[...]texto impreso
By taking into account a geometrical interpretation of the measurement process [1, 2], we define a set of measures of uncertainty. These measures will be called geometrical entropies. The amount of information is defined by considering the metri[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1995-04-10We present an application of linear-programming techniques to generate metameric spectral radiant power distributions. Conditions concerning physical color properties, dominant wavelength, and excitation purity lead us to propose criteria that p[...]texto impreso
Ezquerro Rodríguez, José Miguel ; Carreño Sánchez, Fernando ; Zoido Chamorro, Jesús Manuel | John Wiley & Sons, Inc. | 2003-02A systematic method of analyzing the colorimetric behavior of a set of observers is proposed. The differences between each observer and a standard one are analyzed with different procedures in two color-representation systems. It is apparent tha[...]texto impreso
We present a discussion on the intra-observer and inter-observer variability in judging small color-differences when considering the experimental data provided by Wyszeky and Fielder. By using standard techniques in statistical theory we evalu[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | Sociedad Española de Óptica | 1999In this work we propose a systematic procedure in order to integrate an arbitrary function over any chromaticity diagram similar to that associated with the CIE 1931 standard observer. The precision of this method os checked when smooth function[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | Sociedad Española de Óptica | 1996A systematic analysis of the results obtained by MacAdam is presented. We repeat the calculations with the aid of a computer using the data supplied in his paper and the same equations. Significative differences emerge between the results obtain[...]texto impreso
Due to the variability in the sets of color-matching functions, different real observers have associated different color-representation systems. This fact darks the true interpretation of the experimental results obtained for different observers[...]texto impreso
Alda, Javier ; López Alonso, José Manuel ; Rico García, José María ; Zoido Chamorro, Jesús Manuel ; Boreman, Glenn | SPIE | 2004-04-15The miniaturization of light detectors in the visible and infrared has produced devices with micrometric and sub-micrometric spatial features. Some of these spatial features are closely linked with the physical mechanism of detection. An example[...]texto impreso
Carreño Sánchez, Fernando ; Zoido Chamorro, Jesús Manuel | The Optical Society Of America | 1999-01-01By assuming that color matches are normally distributed in XYZ space, we present a rigorous statistical technique to obtain regions of equally noticeable chromaticity differences. The probability density function of color matches in (x, y, Y) sp[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | IOP Publishing Ltd. | 1999-05Colour detection systems can be specified in terms of a set of spectral functions (colour-matching functions in the case of human observers). By taking these functions into account we define the characteristic matrix associated with a given colo[...]texto impreso
We present a discussion about the influence of luminance on the geometry of color-difference thresholds. By assuming that color matchings are normally distributed in XYZ space, we have shown [Appl Opt 38:208–219 (1999)] that the probability dens[...]texto impreso
Ezquerro Rodríguez, José Miguel ; Carreño Sánchez, Fernando ; Zoido Chamorro, Jesús Manuel ; Bernabeu Martínez, Eusebio | John Wiley & Sons, Inc. | 2001-08In this research we compare the colorimetric behavior of several observers. For color centers recommended by CIE we have produced large sets of spectral distributions, which are metameric for the CIE 1931 standard observer. For each one of the c[...]
