Journal of Light & Visual Environment
Online ISSN : 1349-8398
Print ISSN : 0387-8805
ISSN-L : 0387-8805
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Volume 13, Issue 2
Displaying 1-5 of 5 articles from this issue
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Lecture
Paper
  • Temporal Integration for Wavelength Change of an Equal-luminance Single Pulse
    Keiji UCHIKAWA
    1989 Volume 13 Issue 2 Pages 2_19-2_25
    Published: 1989
    Released on J-STAGE: March 18, 2011
    DOIhttps://doi.org/10.2150/jlve.13.2_19
    JOURNAL FREE ACCESS
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    Temporal integration of a single pulse was studied using a chromatic detection paradigm. In test and reference stimulus fields (45' diameter, 30' horizontal separation), monochromatic lights of the same wavelength were steadily presented at 100 Td. For a duration D, an isoluminant wavelength pulse was substituted in place of the test stimulus. The wavelength difference threshold Δλ, delimiting the detection of chromatic change between the test and reference stimuli, was measured as a function of D. Four wavelengths, 460, 530, 570,and 610 nm, were used for reference stimuli, and D was varied from 5 to 2000 ms. It was found that the Δλ-vs-D functions of 460 and 530 nm differed in shape from those of 570 and 610 nm, indicating slower chromatic responses for shorter reference wavelengths. Chromatic impulse response functions (IRFs), derived in the present study, were compared with those obtained by the double-pulse method previously reported. A possible reason for discrepancy in temporal integration properties among different chromatic responses obtained in several investigations is discussed.
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Translated paper
  • Optical Densities Functions of Lens and Macular Pigment Estimated from the Color Matching Functions
    Yoshinobu Nayatani, Kotaro Takahama, Hiroaki Sobagaki
    1989 Volume 13 Issue 2 Pages 2_26-2_35
    Published: 1989
    Released on J-STAGE: March 18, 2011
    DOIhttps://doi.org/10.2150/jlve.13.2_26
    JOURNAL FREE ACCESS
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    The eye lens and the macular pigment have been treated to be transparent for the long wavelengths. On the other hand, the observer variations of the color matching functions (CMF’s) suggests that the lens and the macular pigment have unneglisible densities in the long wavelengths. In the present paper, improved values for the optical densities are proposed on the basis of the observer variation of CMF’s. First, the principal component analysis is applied to the red CMF’s of Stiles’ 20 observers. The first eigen vector and the second eigen vector correspond to the spectral density functions of lens and macular pigment, respectively. Improved values of densities of lens and macular pigment are defined by connecting the published data of densities with the corresponding eigen vectors. Next, CMF’s of Stiles’ 20 observers are estimated by using the improved values of densities. It is confirmed that these estimated CMF’s fit well the measured CMF’s for the X component of CMF compared with the estimated CMF’s from the published data though there is not an appreciable improvement for the Y and the Z component. Finally, the method of singular value decomposition is applied to the estimated CMF’s from the improved densities. Deviate functions derived agree well with the deviate functions based on the measured CMF’s.
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Committee Report
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