Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
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Volume 43, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 43 Issue 2 Pages 83-86
    Published: April 20, 1980
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.43.83
    JOURNAL FREE ACCESS
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  • On the Digital Masking Process of Color Picture
    Yoichi MIYAKE
    1980 Volume 43 Issue 2 Pages 87-93
    Published: April 20, 1980
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.43.87
    JOURNAL FREE ACCESS
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    Many studies have been done on masking process to get good color reproduction of printing with traditional photographic method and Scanner-Analog computer systems. However, little has been done so far on digital masking process.
    In this paper, a fundamental method of digital masking is introduced. A digital image scanning and exposing system called Photomation P1700 is applied to digital masking.
    Experimental results of color correction used masking equation and tone correction with gray scale transformation are shown.
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  • Tone Correction of Color Picture by Histogram Modification
    Yoichi MIYAKE
    1980 Volume 43 Issue 2 Pages 94-101
    Published: April 20, 1980
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.43.94
    JOURNAL FREE ACCESS
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    Tone correction of picture is commonly performed by using the transformation of photographic characteristic curve known as gamma correction. However, this method is not always possible because the photographic characteristic curve will not be obtained if the gray scale is not recorded in the picture.
    In this paper, a new method for correcting tone of picture is introduced. This method is based on the modification of the cumulative distribution function obtained from the density histogram of picture instead of using the photographic characteristic curve.
    Relations between the cumulative distribution function and the photographic characteristic curve are analyzed and experimental results of tone correction are shown.
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  • Electron Microscope Studies on Radiography (II)
    Dapple in Electron Microscope Image of Silver Halide Particles
    Hiroshi HARA
    1980 Volume 43 Issue 2 Pages 102-107
    Published: April 20, 1980
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.43.102
    JOURNAL FREE ACCESS
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    Dapples obstructing the observation have often appeared in electron microscopic images of the particles, and the appearance is especially remarkable in those of spherical particles.
    For investigating the origin of the dapples, the detail of particles was observed by using specimens obtained from developed silver bleaching and those without carbon evapolating, and normal specimens were observed in transverse direction.
    From such experiments it has been made clear that the dapples are due to the terrace of spherical crystals and to the partial lack of evaporated carbon on the crystal particles.
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  • Simulations on Detective Quantum Efficiency of Black-and-White Negative Film by Using Mathematical Models
    Masao INUI, Souichi KUBO
    1980 Volume 43 Issue 2 Pages 108-110
    Published: April 20, 1980
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.43.108
    JOURNAL FREE ACCESS
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    Simulations on the detective quantum efficiency (DQE) of black-and-white negative film are achieved by using two mathematical models. The mathematical models which used in this study express the photographic characteristic curve, and the relationship between density and corresponding root-meansquare granularity.
    In spite of simple models, this study showed approximately identical results for studies by Shaw who used theoretical models based on the Poisson statistics. Calculating DQE by using the mathematical models is considered to be valuable in practice.
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 43 Issue 2 Pages 111-120
    Published: April 20, 1980
    Released on J-STAGE: August 11, 2011
    DOIhttps://doi.org/10.11454/photogrst1964.43.111
    JOURNAL FREE ACCESS
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