日本写真学会誌
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
37 巻, 1 号
選択された号の論文の4件中1~4を表示しています
  • 澤本 徳美
    1974 年 37 巻 1 号 p. 5-9
    発行日: 1974/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    Generally thinking, Space-Time in representation of photography, is a method of technique of photograph.
    But I think it is an important problem of method of searching substance in photography.
  • ゼラチンおよびポリビニルアルコール皮膜に対するチオシアン酸イオンの透過性
    川崎 正美, 大津 孝昭
    1974 年 37 巻 1 号 p. 10-17
    発行日: 1974/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    The amounts of permeation of thiocyanate ion and of thiosulfate ion through gelatin film, polyvinyl alcohol film, gelatin emulsion film, and polyvinyl alcohol emulsion film were determined with analytical method such as Volhard's method, iodimetry, and colorimetry.
    The results obtained are as follows:
    1) The amount of permeation of thiocyanate ion through the films are greater than that of thiosulfate ion.
    2) The amount of permeation of ammonium thiosulfate through the gelatin film are larger about 15 to 20 percents than that of sodium thiosulfate.
    3) The amount of permeation of ammonium thiosulfate through the gelatin emulsion film did not differ with that of the salt through the polyvinyl alcohol emulsion one.
    4) As to the amount of permeation of thiocyanate ion and thiosulfate ion through the non-hardened gelatin film, the ratios of amount of thiocyanate ion permeated were 1.92 in the case of ammonium thiocyanate and 1.16 in the case of sodium thiocyanate after three minutes, 2.08 and 1.81 after five minutes, 4.24 and 3.00 after ten minutes respectively. Here the amount of thiosulfate ion permeated in the case of ammonium thiosulfate is assumed to be one. The ratio for hardened gelatin film was 1:1.8 approximately.
    5) The amount of permeation of thiocyanate ion through polyvinyl alcohol (vinylon) film increased in the order, LiSCN < Mg (SCN) 2 < NaSCN < NH4SCN < KSCN.
  • アダマール変換を用いた輪郭線の抽出
    三宅 洋一
    1974 年 37 巻 1 号 p. 18-25
    発行日: 1974/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    A high-speed computational algorithm, similar to the fast Fourier Transform algorithm which performs the Hadamard Transformation is applied to the picture processing.
    The boundary-line of human face is detected by the use of a linear filter in the Hadamard domain, with considerable success.
    Since the computations of the Hadamard Transform can be performed only additions and subtractions of real number, the computing speed is higher than the case of the complex Fourier Transform. For a 128 by 128 points scene, the Fourier Transform and inverse can be computed 140 seconds and the Hadamard Transform in 63 seconds on the FACOM 230-60 digital computer.
  • 犬井 正男, 久保 走一
    1974 年 37 巻 1 号 p. 26-36
    発行日: 1974/01/31
    公開日: 2011/08/11
    ジャーナル フリー
    This paper describes a method of computer simulation on the processes of exposure and development in a photographic material.
    The method described by the authors is based on a mathematical model for the transfer gradient characteristics of photographic layer which was examined preliminary. On the numerical analysis of parameters utilized in the mathematical model, a set of characteristics curves which were obtained by experiment was adapted.
    For the computer simulation on the processes of exposure and development in a photographic layer model, the Monte Carlo method was employed.
    The rationality of this computer simulation method was confirmed by comparing the characteristics curves which were generated by this method and those of obtained by experimentally.
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