John Cadou

Abstract

A comparison of the sine-wave and edge gradient MTF measurement methods, on a photographic black and white film, was performed. A statistical test, a CMT acutance test, and a graphical comparison showed that there was no significant difference between the two measurement methods. This was true for the film processed to have large adjacency effects, as well as for the film processed to have no adjacency effects; however, the agreement was slightly better for the latter process. The research also showed that aligning the midpoints of the edge traces, normalizing the individual edge traces, and then averaging several edge traces significantly reduced grain noise, and produced a superior representative edge for MTF analysis. A new adaptive damping filter also proved quite successful in the suppression of grain noise without degrading the MTF measurement. The combination of averaging several edge traces, and then using the adaptive filter, produced excellent MTF results from the edge traces.

Library of Congress Subject Headings

Transfer functions; Photographic emulsions; Photographic optics

Publication Date

7-24-1985

Document Type

Thesis

Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)

Advisor

Granger, Edward

Advisor/Committee Member

Altman, Joseph

Advisor/Committee Member

Doerner, Edward

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in December 2013.

Physical copy available from RIT's Wallace Library at TR220 .C33 1985

Campus

RIT – Main Campus

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