Scans in Measuring Wiener Spectra for Photographic Granularity

スポンサーリンク

概要

• 論文の詳細を見る

• The Wiener spectrum obtained in one dimensional scanning method is proved theoretically to be given as an integral of the two dimensional Wiener spectrum along one spatial frequency axis perpendicular to the scanning direction. This relation is verified experimentally by studying the changes of the Wiener spectrum affected by slit widthes of a scanning aperture. The slit width along the scanning direction determines the frequency pass band of the Wiener spectrum, and the slit width perpendicular to the scanning direction determines the sectional area of two dimensional Wiener spectrum. A new granularity factor (b・Φ_m(ν)=const. for a given film) is suggested as an objective measure for the photographic granularity, where b is the slit width perpendicular to the scanning direction and Φ_m(ν) is the Wiener spectrum at the spatial frequency ν. This simple formula similar to the Selwyn relation is confirmed theoretically and experimentally to be valid, when b is large enough.

• 社団法人応用物理学会の論文
• 1966-12-15

著者

• Doi Kunio

  Research Department Dai Nippon Toryo Co. Ltd.

関連論文

• Role of Optical Transfer Function for Optimum Magnification in Enlargement Radiography
• Evaluation of Transient Luminescent Phenomena by Frequency Characteristics
• Scans in Measuring Wiener Spectra for Photographic Granularity

スポンサーリンク