Contrast Improvement by Low-frequency Attenuation
作者:
K. Stoyanova,
P. Sharlandjiev,
T. Todorov,
L. Nikolova,
期刊:
Optica Acta: International Journal of Optics
(Taylor Available online 1983)
卷期:
Volume 30,
issue 2
页码: 199-206
ISSN:0030-3909
年代: 1983
DOI:10.1080/713821150
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Some features of contrast improvement by low-frequency attenuation are described on the basis of a one-dimensional model. The properties deduced are verified experimentally in a coherent image-enhancement system. A rigid mixture of fluorescein in orthoboric acid is used as a spatial filter. Its photo-induced change permits variable optical density of the filter as well as variable filter dimensions in the spatial frequency plane.
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