Searched for: author%3A%22Walraven%2C+P.L.%22
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Walraven, P.L. (author), TNO Defensie en Veiligheid (author)
Stiles and Crawford showed over 75 years ago that the sensitivity of the retina varies with the place of entry of the light into the pupil, and thus with the direction of incidence of light upon the retina. The effect is a property of the cones. Rods have a very limited directional sensitivity with a common centre of symmetry with the hotopic SC...
article 2009
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TNO Technische Menskunde (author), Walraven, P.L. (author)
In 1931 CIE widened the scope of the photometric standard observer with the addition of colorimetric properties based on experimental studies by Wright and by Guild. Both of these studies were in terms of relative intensities, so that their final colour matching functions could only be defined after calibration with the 1924 VSOH function. 25...
conference paper 1999
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Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
bookPart 1994
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Vos, J.J. (author), Estevez, O. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
New action spectra are derived for the foveal cones on the basis of three assumptions: (1) the Stiles-Burch (1959) colorimetric data are better than CIE 1931; (2) the long wavelength flanks of the dichromatic luminosity functions offer better anchorage than the confusion loci; and (3) the relative mutual heights per receptor can be derived from...
article 1990
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Walraven, P.L. (author), Walraven, J. (author), Instituut voor Zintuigfysiologie TNO (author)
conference paper 1989
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Vos, J.J. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
article 1987
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Vos, J.J. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
bookPart 1984
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Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
article 1981
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de Vries-de Mol, B.C. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
conference paper 1981
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Instituut voor Zintuigfysiologie TNO (author), Walraven, P.L. (author)
article 1981
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Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
bookPart 1978
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Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
Normal colour vision is presently described in the framework of one or other trichromatic opponent model. The trichromacy finds its origin in three different pigments, these pigments having maximal absorption in different parts of the spectrum. The absorption spectra determine the spectral sensitivities of the three colour mediating systems. The...
conference paper 1976
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Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
On the basis of new experimental data of tritanopic vision the convergence centre for tritanopia has been redetermined, and has turned out to bex' = 0.1747,y' = 0.0060 in the Judd 1951-chromaticity diagram. A consequence of this determination is that the blue system is more sensitive than was concluded from the Thomson-Wright (1953) study. The...
article 1974
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Instituut voor Zintuigfysiologie TNO (author), Walraven, P.L. (author)
article 1974
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de Boer, J.B. (author), Burghout, F. (author), Dorp, J.C. (author), Groenhart, G. (author), van der Hoff, L. (author), van der Kolk, J. (author), Moerman, J.J.B. (author), Rutgers, G.A.W. (author), Schreuder, D.A. (author), Standaar, A.W. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
This publication gives explanatory comments on the Dutch standard NEN 3322 "Road traffic control light signals. Photometric requirements and test methods", published in December 1972. After a general introduction in chapter 1, chapter 2 deals with the fundamental aspects that were used as a basis when drawing up the requirements for chromaticity...
article 1973
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Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
article 1973
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Instituut voor Zintuigfysiologie TNO (author), Vos, J.J. (author), Walraven, P.L. (author)
bookPart 1973
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Instituut voor Zintuigfysiologie TNO (author), Walraven, P.L. (author)
conference paper 1973
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Vos, J.J. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
A mathematical description is given of colour discrimination which rests on three assumptions: 1. (1) Colour processing occurs in a Helmholtz-type three receptor-zone, followed by a Hering-type neural-conversion-zone in which a luminance (L) and two antagonistic (R vs. G and Y vs. B) signals are formed. 2. (2) Colour discrimination is...
article 1972
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Vos, J.J. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
On the basis of the concepts, discussed in Part I of this study, a line element is developed to describe colour discrimination data. First the simple case of unsaturated neural data transmission is treated. Then complicating effects of saturation and supersaturation are introduced. The goodness of fit with shapes and orientation of JND-ellipses...
article 1972
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