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Color Imaging Lab - University of Granada - Spain

Papers published in refereed journals

Multispectral color imaging

  1. C. Plata, J. L. Nieves, E.M. Valero and J. Romero, "Trichromatic red–green–blue camera used for the recovery of albedo and reflectance of rough-textured surfaces under different illumination conditions", Appl. Opt. 48, 3643-3653 (2009) PDF
  2. M.A. López-Álvarez, J. Hernández-Andrés, J. Romero, J. Campos and A. Pons, "Calibrating the elements of a multispectral imaging system", J. Imaging Sci. Technol. 53, 031102-1-031110-10, (2009) PDF
  3. F.J. Olmo, A. Cazorla, L. Alados-Arboledas, M.A. López-Álvarez, J. Hernández-Andrés and J.Romero, "Retrieval of the optical depth by an all-sky CCD camera", App. Opt. 47, H182-H189 (2008) PDF
  4. M.A. López-Álvarez, J.Hernández-Andrés, J. Romero, F.J. Olmo, A. Cazorla, L. Alados-Arboledas, "Using a trichromatic CCD camera for spectral skylight estimation", Appl. Opt. 47, H31-H38, (2008) PDF
  5. M.A. López-Álvarez, J.Hernández-Andrés, J. Romero, "Developing an optimum computer-designed multispectral system comprising a monochrome CCD camera and a liquid-crystal tunable filter", Appl. Opt. 47, 4381-4390 (2008) PDF
  6. J. L. Nieves, C. Plata, E. M. Valero, J. Romero, "Unsupervised illuminant estimation from natural scenes: an RGB digital camera suffices", Appl. Opt. 47, 3574-3584 (2008) PDF
  7. J. L. Nieves, E.M. Valero, J.Hernández-Andrés, J. Romero, "Recovering fluorescent spectra with an RGB digital camera and color filters using different matrix factorizations", Appl.Opt. 46, 4144-4154 (2007) PDF
  8. M.A. López-Álvarez, J.Hernández-Andrés, E.M. Valero, J. Romero, "Selecting algorithms, sensors and linear bases for optimum spectral recovery of skylight", J.Opt.Soc.Am. A, 24, 942-956 (2007) PDF
  9. J. L. Nieves, E. Valero, S. M. C. Nascimento, J. Hernández-Andrés and J. Romero. "Multispectral síntesis of daylight using a comercial CCD camera", Appl.Opt. 44, 5696-5703 (2005). PDF
  10. M. A. López-Alvarez, J. Hernández-Andrés, R. L. Lee Jr. and J. Romero, "Designing a practical system for spectral imaging of skylight", Appl.Opt. 44, 5688-5695 (2005). PDF
  11. R. Lenz, T.H. Bui, and J.Hernández-Andrés. "Group theoretical structure of spectral spaces", J.Math.Imaging and Vision 23, 297-313 (2005). PDF
  12. J. Hernández-Andrés, J. L. Nieves, E. Valero and J. Romero,"Spectral daylight recovery using only a few sensors", J.Opt.Soc.Am. A 21, 13-23 (2004). PDF
  13. J. L. Nieves, J. Hernández-Andrés, E. Valero and J. Romero, "Spectral-reflectance linear models for color-pattern recognition". Appl.Opt. 43, 1880-1891 (2004). PDF
  14. J. Hernández-Andrés, J. L. Nieves, J. Romero and R. L. Lee Jr. "Color and spectral analysis of daylight in Southern Europe", J.Opt.Soc.Am. A 18, 1025-1035 (2001). PDF
  15. J. Hernández-Andrés, J. Romero and R. L. Lee Jr., "Colorimetric and spectroradiometric characteristics of narrow FOV clear skylight in Granada, Spain", J.Opt.Soc.Am. A. 18, 412-420 (2001). PDF
  16. J. Hernández-Andrés, J. Romero, A. García-Beltrán and J. L. Nieves, "Testing linear models on spectral daylight measurements" Appl.Opt. 37, 971-977 (1998). PDF
  17. A. García-Beltrán, J. L. Nieves, J. Hernández-Andrés and J. Romero, "Linear bases for spectral reflectance functions of acrylic paints", Color Res.Appl. 23, 39-45 (1998). PDF
  18. J. Romero, A. García-Beltrán and J. Hernández-Andrés, "Linear bases for representation of natural and artifitial illuminants", J.Opt.Soc.Am. A 14, 1007-1014 (1997). PDF
  19. J. Romero, A. García Beltrán, L. Jiménez del Barco and J. A. García, "Linear model of surface spectral reflectance for samples of five different hues", J. Optics 23, 41 48 (1992).

    20. Computational color vision and color imaging

  20. J. Romero, D. Partal, J.L. Nieves and J. Hernández-Andrés, "Sensor-response-ratio constancy under changes in natural and artificial illuminants", Color Res. Appl. 32, 284-292 (2007) PDF
  21. J. Romero, J. Hernández-Andrés, J. L. Nieves and E. Valero, "Spectral sensitivity of sensors for a color-image descriptor invariant to changes in daylight conditions". Color Res.Appl. 31, 391-398 (2006) PDF
  22. J. Romero, E. Valero, J. Hernández-Andrés and J. L. Nieves, "Color-signal filtering in the Fourier-frequency domain", J.Opt.Soc.Am. A 20, 1714-1724 (2003). PDF
  23. J. L. Nieves, F. Pérez-Ocón, J. Hernández-Andrés and J. Romero, "Spectral-reflectance function recovery for improved colour-constancy experiments", Displays 23, 213-222 (2002). PDF
  24. M. S. Millán, M. Corbalán, J. Romero and M. J. Yzuel, "Optical pattern recognition using color vision models", Opt.Lett. 20, 1722-1724 (1995). PDF
  25. J. Romero, J. L. Nieves and A. García-Beltrán, "Human processing of colour information in the chromatic-frequency domain". Vision Res. 35, 867-871 (1995). PDF
  26. J. Romero, J. L. Nieves, A. García-Beltrán and E. Hita, "Analysis of colour-vision models in the chromatic-frequency domain", J.Optics 26, 9-15 (1995).
  27. J. Romero, L. Jiménez del Barco and E. Hita, "Mathematical reconstruction of color-matching functions", J.Opt.Soc.Am. A 9, 25-29 (1992). PDF

    28. Color vision and colorimetry

  28. S.D. Gedzelman, J. Hernández-Andrés, "Fountain rainbows", Appl. Opt. 47, H220-H224, (2008) PDF
  29. S.D. Gedzelman, M.A. López-Álvarez, J. Hernández-Andrés and R. Greenler, "Quantifying the "milky sky" experiment", Appl. Opt. 47, H128-H132, (2008) PDF
  30. S. Johnsen, A. Kelber, E. Warrant, A.M. Sweeney, E.A. Widder, R.L. Lee, Jr., and J.Hernández-Andrés, "Crepuscular and nocturnal illumination and its effects on color perception by the nocturnal hawkmoth Deilephila elpenor". J. Exp. Biol., 209, 789-800 (2006) PDF
  31. R.L. Lee, Jr., and J.Hernández-Andrés, "Colors of the daytime overcast sky", Appl.Opt. 44, 5712-5722 (2005). PDF
  32. R.L. Lee, Jr., and J.Hernández-Andrés, "Short-term variability of overcast brightness", Appl.Opt. 44, 5704-5711 (2005). PDF
  33. E. Valero, J. L. Nieves, J. Hernández-Andrés, J. A. García, "Changes in contrast thresholds with mean luminance for chromatic and luminance gratigns: a re-examination of the transtion from the DeVries-Rose to Weber regions", Color Res.Appl. 29, 178-182 (2004). PDF
  34. J. L. Nieves, E. Valero, J. Hernández-Andrés and J. Romero. "Color-appearance of surfaces as affected by different-time-varying colour-adaptation sequences". Optical Review 10, 221-230 (2003).
  35. R.L. Lee, Jr., and J.Hernández-Andrés, "Measuring and modeling twilight's purple light", Appl.Opt. 42, 445-457 (2003). PDF
  36. J. Hernández-Andrés, R. L. Lee Jr., and J. Romero, "Color and luminance asymmetries in the clear sky", Appl.Opt. 42, 458-464 (2003). PDF
  37. J.Romero, J. Hernández-Andrés, J. L. Nieves and J. A. García, "Color coordinates of objects with daylight changes", Color Res.Appl. 28, 25-35 (2003). PDF
  38. V. Bonnardel, E. Valero. "Study of colour discrimination with comb-filtered spectra", Vision Res. 41, 541-548 (2001). PDF
  39. D. H. Foster, S. M. C. Nascimento, K. Amano, L. Arend, K. Linnell, J. L. Nieves, S. Pret and J. S. Foster. "Parallel detection of violations of color constancy", Proceedings of the National Academy of Sciences 98, 8151-8156 (2001). PDF
  40. J. L. Nieves, A. García-Beltrán and J. Romero, "Response of human visual System to variable illuminant conditions: an analysis of opponent-color mechanisms in color constancy", Ophthalm. Physiol.Opt. 20, 44-58 (2000).
  41. J. L. Nieves, J. Romero, J. A. García and E. Hita, "Visual system' s adjustment to illuminant changes: heuristic-based model revisited", Vision Res. 40, 391-399 (2000). PDF
  42. J. A. García, J. L. Nieves, E. Valero and J. Romero, "Stochastic independence of color-vision mechanisms confirmed by a subthrsholds summation paradigm", J.Opt.Soc.Am. A 17, 1485-1488 (2000). PDF
  43. J. Hernández-Andrés, R. L. Lee Jr. and J. Romero, "Calculating correlated color temperatures across the entire gamut of daylight and skylight chromaticities". Appl. Opt. 38, 5703-5709 (1999). PDF
  44. E. Valero, J. A. García, J. L. Nieves and J. Romero, "Measurements of sensitivity to simulated chromatic frequencies for normal and dichromatic observers", J. Optics 29, 339-344 (1998).
  45. J. Romero, J. A. García, E. Valero and J. L. Nieves, "Measurements of the spectral modulation sensitivity function for two normal observers with CRT monitors", J. Optics 28, 190-198 (1997).

Papers in international conferences (since 2001)

    1. S. Ratnasingam, S. Collins, J. Hernández-Andrés, "A Method for Designing and Assessing Sensors for Chromaticity Constancy in High Dynamic Range Scenes", Color Imaging Conference CIC17, Alburquerque, New Mexico (EEUU) (2009).
    2. J. Romero, R. Luzón, J. Hernández-Andrés, J.L. Nieves, "Color changes in a natural scene due to the interaction between the light and the atmosphere", 11th Congress of the International Colour Association AIC 2009, Sidney (Australia) (2009)
    3. C. Plata, S.M.C. Nascimento, J.L. Nieves, "Accuracy of photometric stereo estimated with textured calibration samples", 20th Symposium of the International Colour Vision Society, Braga (Portugal) (2009)
    4. M. A. López-Álvarez, J. Hernández-Andrés, E. M. Valero, J. L. Nieves, "New sample election method for multispectral system color calibration", Congress of the International Colour Association (AIC’08), Stockholm (Sweden), (2008).
    5. C. Plata, E.M. Valero, J.L. Nieves, J. Romero, "Supervised training sample selection for the estimation of spectral reflectance using a RGB camera", IS&T/ 4th European Conference on Color in Graphics, Imaging and Vision, CGIV 2008, pp. 519-522, Terrassa (Spain), (2008)
    6. E.M. Valero, J.L. Nieves, C. Plata, J. Romero, "Unsupervised classification algorithms applied to RGB data as a preprocessing step for reflectance estimation in natural scenes", IS&T/ 4th European Conference on Color in Graphics, Imaging and Vision, CGIV 2008, pp. 523-526, Terrassa (Spain), (2008)
    7. C. Plata, J.L. Nieves, J. Romero, "Combining spectral and photometric stereo techniques for reflectance estimation using an RGB digital camera", IS&T/ 4th European Conference on Colour in Graphics, Image and Vision, CGIV 2008, pp. 516-518, Terrassa (Spain), (2008)
    8. M. A. López-Álvarez, J. Hernández-Andrés, J. Romero, "Building an optimum computer-designed multispectral system for skylight acquisition", IS&T/ 4th European Conference on Color in Graphics, Imaging and Vision, CGIV 2008, Terrassa (Spain), (2008)
    9. F. J. Olmo, A. Cazorla, L. Alados-Arboledas, M. A. López-Álvarez, J. Hernández-Andrés, J. Romero, "Using All-Sky Imager to obtain aerosol and cloud optical properties", 9th International Meeting on Meteorological Optics, Montana, EE.UU., (2007).
    10. M. A. López-Álvarez, J. Hernández-Andrés, J. Romero, F. J. Olmo, A. Cazorla, and L. Alados-Arboledas, "Taking advantage of a trichromatic CCD digital camera for spectral estimation", 9th International Meeting on Meteorological Optics, Montana, EE.UU., (2007)
    11. M.A. López-Álvarez, E.M. Valero, J. Hernández-Andrés, "Separating illuminant and surface reflectance spectra from filtered trichromatic camera measurements", IS&T's 3rd European Conference on Colour in Graphics, Imaging, and Vision, Leeds, UK, (2006)
    12. J.L. Nieves, E. Valero, J. Hernández-Andrés, J. Romero, "Spectral recovery of artificial illuminants using a CCD colour camera with Nonnegative Matrix Factorization and Independent Component Analysis", IS&T's 3rd European Conference on Colour in Graphics, Imaging, and Vision, Leeds, UK, (2006)
    13. E.M. Valero, J.L. Nieves, S.M.C. Nascimento, K. Amano, D.H. Foster,"Spectral recovery from natural scenes with an RGB digital camera", IS&T's 3rd European Conference on Colour in Graphics, Imaging, and Vision, Leeds, UK, (2006)
    14. M. A. López-Alvarez, J. Hernández-Andrés, J. L. Nieves and J. Romero, "Influence of the recovery method on the optimum sensors for spectral imaging of skylight". Electronic Imaging 2006, Eighth International Symposium on Multispectral Color Science, San José, California, EEUU, (2006), Proceedings Book, SPIE 6062, 091-099 (2006).
    15. J. Romero, D. Partal, J. L. Nieves and J. Hernández-Andrés, "Color-signal ratio dependence of natural and artificial illuminants". AIC Colour 05, Granada, Spain, (2005), Proceedings Book, pp. 883-886.
    16. E. Valero, J. L. Nieves, J. Hernández-Andrés and J. Romero, "Image quality evaluation for ICA-based compression of natural scenes", AIC Colour 05, Granada, Spain, (2005), Proceedings Book, pp. 527-530.
    17. M. A. López-Alvarez, J. Hernández-Andrés, R. L. Lee Jr. and J. Romero, "Optimal sensors for recovering skylight in the presence of noise", AIC Colour 05, Granada, Spain, (2005), Proceedings Book, pp. 197-200.
    18. J. L. Nieves, E. Valero, S. M. C. Nascimento, J. Hernández-Andrés and J. Romero, "Multispectral synthesis of daylight using a digital CCD camera". AIC Colour 05, Granada, Spain, (2005), Proceedings Book, pp. 189-192.
    19. M.A. López-Álvarez, J. Hernández-Andrés, E.M. Valero, J.L. Nieves, "Colorimetric and spectral combined metric for the optimization of multispectral systems", AIC Colour 05, Granada, Spain, (2005), Proceedings Book, pp. 1685-1688.
    20. C. Plata, E.M. Valero, A. Cazorla, F.J. Olmo, L. Alados-Arboledas, J. Hernández-Andrés, J.L. Nieves, "Identification of clouds and sky in digital images using a principal component analysis", AIC Colour 05, Granada, Spain, (2005), Proceedings Book, pp. 1689-1692.
    21. J. Hernández-Andrés, E. Valero, J. L. Nieves and J. Romero, "Optimal spectral sensitivities of a multispectral image acquisition system", Second European Conference on Color in Graphics, Imaging and Vision, Aachen, Germany, (2004), Proceedings, pp. 418-421.
    22. E. Valero, J. L. Nieves, J. Hernández-Andrés and J. Romero, "Independent component analysis with different daylight illuminants", Second European Conference on Color in Graphics, Imaging and Vision, Aachen, Germany, (2004), Proceedings, pp. 193-196.
    23. J. L. Nieves, J. Hernández-Andrés, E. Valero and J. Romero, "Optimal color pattern recognition based on linear models of surface and illumination spectra", Second European Conference on Color in Graphics, Imaging and Vision, Aachen, Germany, (2004), Proceedings, pp. 125-129.
    24. J. Romero, J. Hernández-Andrés, J. L. Nieves and E. Valero, "Testing spectral sensitivity of sensors for color invariant at a píxel", Second European Conference on Color in Graphics, Imaging and Vision, Aachen, Germany, (2004), Proceedings, pp. 106-109.
    25. R. Lenz and J. Hernández-Andrés, "Time-Frequency Analysis for Multi-Channel Color Pattern Recognition", Second European Conference on Color in Graphics, Imaging and Vision, Aachen, Germany, (2004), Proceedings, pp. 509-514.
    26. J. Hernández-Andrés, M.A. López-Álvarez, R.L. Lee, Jr., "Towards a skylight spectral remote sensing camera", 8th Topical Meeting in Meteorological Optics (2004), Bad Honnef, Germany
    27. R.L. Lee, Jr., J. Hernández-Andrés, "Temporal variability of overcast illuminances", 8th Topical Meeting in Meteorological Optics (2004), Bad Honnef, Germany
    28. R.L. Lee, Jr., J. Hernández-Andrés, "Colors of clear and overcast skies", 8th Topical Meeting in Meteorological Optics (2004), Bad Honnef, Germany
    29. R. Lenz, T. H. Bui, J. Hernández-Andrés, "One-parameter subgroups and the chromaticity properties of time-changing illumination spectra", IS&T/SPIE Symposium Electronic Imaging Science and Technology, Santa Clara, California, USA, (2003), Proceedings SPIE, Vol. 5008, pp. 237-248.
    30. J. Romero, J. L. Nieves, E. Valero, J. Hernández-Andrés and J. A. García, "Loss of spectral information in the color signals filtered by the human visual system", First European Conference on Color in Graphics, Imaging and Vision, Poitiers, FRANCE, (2002), Proceedings, pp. 109-111.
    31. J. L. Nieves, E. Valero, J. Hernández-Andrés, J. A. García and J. Romero, "Influence of the mean luminance on the detection threshold for red-green chromatic gratings". AIC 2001 Meeting, Rochester, NY, USA (2001), Proceedings SPIE Vol. 4421, pp. 833-835.
    32. J. Hernández-Andrés, J. Romero and J. L. Nieves, "Daylight spectral power distribution recovery through a linear model and new filters", AIC 2001 Meeting, Rochester, NY, USA (2001), Proceedings SPIE Vol. 4421, pp. 359-362.
    33. J. Hernández-Andrés, R. L. Lee, Jr. and J. Romero, "Color asymmetries in narrow-FOV clear-sky radiances", Topical Meeting in Meteorological Optics 2001, Boulder, CO, USA (2001), Abstract book, pp. 40-40a
    34. R. L. Lee, Jr. and J. Hernández-Andrés, "Twilight's purple light: new evidence on an old problem", Topical Meeting in Meteorological Optics 2001, Boulder, CO, USA (2001), Abstract book, pp. 42-43.