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Optical Engineering

Digital Image Quality And Interpretability: Database And Hardcopy Studies
Author(s): H. L. Snyder; M. E. Maddox; D. I. Shedivy; J. A. Turpin; J. J. Burke; R. N. Strickland
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Paper Abstract

Two hundred fifty transparencies, displaying a new digital database consisting of 25 degraded versions (5 blur levels x 5 noise levels) of each of 10 digitized, first-generation positive transparencies, were used in two experiments involving 15 trained military photointer-preters. Each image is 86 mm square and represents 40962 8-bit pixels. In the "interpretation" experiment, each photointerpreter (judge) spent approximately two days extracting essential elements of information (EEls) from one degraded version of each scene at a constant Gaussian blur level (FWHM = 40, 84, or 322 Am). In the scaling experiment, each judge assigned a numerical value to each of the 250 images, according to its perceived position on a 10-point NATO-standardized scale (0 = useless through 9 = nearly perfect), to the nearest 0.1 unit. Eighty-eight of the 100 possible values were used by the judges, indicating that 62 categories, based on the Shannon-Wiener measure of information, are needed to scale these hardcopy images. The overall correlation between the scaling and interpretation results was 0.9. Though the main effect of blur was not statistically significant in the interpretation experiment, that of noise was significant, and all main factors (blur, noise, scene, order of battle) and most interactions were statistically significant in the scaling experiment.

Paper Details

Date Published: 1 February 1982
PDF: 9 pages
Opt. Eng. 21(1) 210114 doi: 10.1117/12.7972851
Published in: Optical Engineering Volume 21, Issue 1
Show Author Affiliations
H. L. Snyder, Virginia Polytechnic Institute and State University (United States)
M. E. Maddox, Virginia Polytechnic Institute and State University (United States)
D. I. Shedivy, Virginia Polytechnic Institute and State University (United States)
J. A. Turpin, Virginia Polytechnic Institute and State University (United States)
J. J. Burke, University of Arizona (United States)
R. N. Strickland, University of Arizona (United States)

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