STUDY OF IMAGE-EVALUATION TECHNIQUES.
Interim engineering rept. no. 7, 15 Dec 63-15 Apr 64,
ITEK CORP WALTHAM MASS
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The goal of this image evaluation study is the development of a mathematical model for calculating the performance of reconnaissance systems. An essential foundation for this effort is the ability to measure or calculate the physical characteristics of lenses, emulsions, and other components of these systems with the requisite accuracy. Interim Engineering Report AD-600 950 described progress made with the Itek Image Analyzer Unit Model II used for measuring the transfer functions of lenses. This report presents calculations of the line spread function and edge spread function as derived from the transfer function the axial image is considered in the presence of various degrees of third-order spherical aberration and defocusing. A simplified graphical method for deriving single-bar response from the edge spread function is described. Experimental work is recorded on the measurement of lens-film transfer functions, in which both sinusoidal targets and edges are used, with SO-243 emulsion. The mathematical basis for the transform program currently used with Iteks CDC-924 computer when deriving transfer functions from edge traces is described. Finally, an account of continued work on the coherent light method for measuring emulsion transfer functions is presented.