26 September 1997 Linearization of the characteristic curve near photographic fog opens new horizons in photographic photometry
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Abstract
It has been shown that with correctly defined fog level of the exposed and developed photographic emulsion the characteristic curve of photographic emulsion from the linear region to the low exposure one may be linearized by using the Seidel function. For characteristic curve fitting one should know three approximation constants which may be calculated by three reference points on the image represented by three densities at three different exposures. Different exposures may be realized by different intensities of illuminating light at the same exposure time as well as by taking three images of the same object at different exposure times.
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Yury S. Muzalievsky, Yury S. Muzalievsky, } "Linearization of the characteristic curve near photographic fog opens new horizons in photographic photometry", Proc. SPIE 3140, Photometric Engineering of Sources and Systems, (26 September 1997); doi: 10.1117/12.279228; https://doi.org/10.1117/12.279228
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