Analysis of printability of images modulated by laser speckle pattern (Part 1)

DOI
  • Mishina Hiromichi
    Department of Image Science and Technology Faculty of Engineering, Chiba University
  • Tanaka Tsuneo
    Department of Image Science and Technology Faculty of Engineering, Chiba University

Bibliographic Information

Other Title
  • 結像面スペックルの統計と画像記録特性　Ｉ　　スペックル強度の一次統計とスクリンレンジ特性の理論的解析
  • スペックル強度の一次統計とスクリンレンジ特性の理論的解析

Description

A New image modulation process for printing by means of laser speckle pattern is proposed and analysed theoretically by standing on optical and staitistical base. In this method, image plane laser speckle pattern is used for the modulation in a platemaking process instead of usual contact or glass screesn. It can be shown that the characteristics of image modulation in this process are closely related to the first order statistics of laser speckle which represent the intensity probability distribution function.<br>By considering the platemaking and printing process, the relation between the density of the original and printed image is obtained for various surface roughness and different parameters of optical system. As the results, the widest and most linear reproduction curve is given when the speckle pattern having the contrast value of 0.5 is used for image modulation. The screen range of speckle modulation depends strongly on the ratio of the threshold level of the sensitized plate to the average intensity level of the speckle pattern.

Journal

Details 詳細情報について

  • CRID
    1390282679066244224
  • NII Article ID
    130004186357
  • DOI
    10.11413/nig1958.21.13
  • ISSN
    21851263
    00400874
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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