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DO PRESENT STANDARDS ASSURE
PHOTOGRAPHIC INTERPRETABILITY?
By
SAMUEL BOUSKY
ABSTRACT
Considering that the interpretability of aerial photographs depends
upon the ability to identify recordable detail, several aspects, ordinar-
ily accepted as standard, are explored from this standpoint. The pet-
formance of lenses and emulsions usually specified in terms of high
contrast resolution, tends toward image forming characteristics other
than optimum for actual detail interpretability. Processing procedures
long accepted as proper do not necessarily assure maximum interpreta-
bility in the recorded image. Efficiency specifications for shutters
may have very little effect on the capability to identify detail. Spread
function analysis and frequency response testing may bear a close
relationship to actual detail interpretability, and may also have useful
significance in terms of testing with isolated geometric target shapes.
DO PRESENT STANDARDS
ASSURE PHOTOGRAPHIC INTERPRETABILITY?
Those associated with aerial photography, particularly the aspects
dealing with the interpretation of recorded detail, have adopted certain
ways of thinking of the effectiveness of the components making up a
photographic system. These represent criteria, either implied or de-
fined, that are relied upon, or at least accepted, for the purpose of
evaluating and controlling photographic performance. Several of these
have gained extensive popular usage because they are convenient to
use or because they are so obviously logical and understandable. Yet
some of these apparent standards that have in the past served so well
in advancing the start-of-the-art, have now outlived their usefulness
while others are indirectly impeding technical progress.
The time has come, therefore, to re-examine the standards by
which judgments are being made, to see whether they are still adequate
as ‘‘road markers’’ to lead the way to a fruitful future in photo-
graphic technology.
Paper prepared for publication in PHOTOGRAMMETRIA and for presentation
before the INTERNATIONAL SOCIETY OF PHOTOGRAMMETRY, Septem-
ber 9, 1960 in London, England.
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