This report documents a study conducted to examine the correlation between identification thresholds and difference spectra of some resolving power target characters. The experiment included the USAF Tri-bar target, the RIT Alpha-numeric Resolving Power Target, and a set of targets called the Granger Modified Tri-bar targets. Assuming that target identification is a filtering process and primarily a function of its frequency spectrum, this study began with a prediction of targets that would have equal identification thresholds from difference spectra considerations. Target images were viewed at various sizes to confirm/refute the original hypothesis. The USAF targets demonstrated adequate control of experimental variables. The RIT and Granger characters both revealed the existence of one or more factors in addition to difference spectra which significantly contribute to target identification. It is conjectured that boundary effects may be that important contributor to image identification.
Library of Congress Subject Headings
Resolution (Optics); Photographic optics; Fourier analysis
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Greene, James, "A Study of comparable identifiably predictions of some resolving power targets by Fourier spectra considerations" (1983). Thesis. Rochester Institute of Technology. Accessed from
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