Photographic Emulsion Threshold Functions Study.
Final rept. Jul 72-Jan 75,
AIR FORCE AVIONICS LAB WRIGHT-PATTERSON AFB OHIO
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The main objective of this effort was to establish an in-house capability to generate threshold functions for photographic B and W films. A secondary objective was to investigate the effect of the microcamera numerical aperture, light source spectral distribution, and the microcamera transfer function type on the MTF x AIM intercept. An experiment was run to generate threshold data for four primary photographic emulsions 2402, 2403, 3400, and 3414 and two secondary photographic emulsions FE3215 and 3404 under three numerical apertures 0.16, 0.30, and 0.65, two spectral distributions 550 nm and daylight, and three transfer function types MTF, square wave response, and tri-bar response. The optimum, 95 confidence limits, and or - one stop threshold function were crossed with four typical lenses MTF. The resulting intercepts were statistically analyzed for significancy in the data. The experiment showed that the threshold function are insensitive to changes in NA, spectral distribution, and transfer function type for the conditions tested and within the experimental error. Most important, an in-house capability was established to generate threshold functions under a wide range of conditions.