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Proceedings Paper

Introductory Modern Methods Of Image Assessment
Author(s): H. H. Hopkins
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Paper Abstract

An introductory survey is given of the methods used in modern image assessment. The need for the introduction of the optical transfer function is first considered, together with the validity of regarding image formation as a linear process. The concepts of the contrast transfer function, the phase transfer function, and their complex form the optical transfer function, are introduced by considering the image of a cosine-wave intensity distribution: the relationships these bear to the line spread function (impulse response) of the optical system are established. A tolerancing of production runs, for both contrast and phase transfer functions,is proposed, based on the use of two suitably chosen spatial frequencies. The manner in which the range of spatial frequencies of interest affects the degree of correction of aberration required is also discussed. The final section derives the interrelationships between the point spread function, the line spread function, the edge spread function, and the transfer function.

Paper Details

Date Published: 29 October 1981
PDF: 12 pages
Proc. SPIE 0274, Assessment of Imaging Systems II, (29 October 1981); doi: 10.1117/12.931827
Show Author Affiliations
H. H. Hopkins, The University of Reading (United Kingdom)


Published in SPIE Proceedings Vol. 0274:
Assessment of Imaging Systems II
Thomas L. Williams, Editor(s)

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