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Image enhancement filters significantly improve reading performance for low vision observersAs people age, so do their photoreceptors; many photoreceptors in central vision stop functioning when a person reaches their late sixties or early seventies. Low vision observers with losses in central vision, those with age-related maculopathies, were studied. Low vision observers no longer see high spatial frequencies, being unable to resolve fine edge detail. We developed image enhancement filters to compensate for the low vision observer's losses in contrast sensitivity to intermediate and high spatial frequencies. The filters work by boosting the amplitude of the less visible intermediate spatial frequencies. The lower spatial frequencies. These image enhancement filters not only reduce the magnification needed for reading by up to 70 percent, but they also increase the observer's reading speed by 2-4 times. A summary of this research is presented.
Document ID
19930044726
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lawton, T. B.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Ophthalmic and Physiological Optics
Volume: 12
Issue: 2
ISSN: 0275-5408
Subject Category
Aerospace Medicine
Accession Number
93A28723
Distribution Limits
Public
Copyright
Other

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