26 September 1997 Rising of the characteristic curve gradient near photographic fog
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Abstract
The low characteristic curve (CC) gradient of the exposed and developed photographic emulsion (PE) near fog imposes certain restrictions on the photographic photometry accuracy and the weak object detection threshold. The conventional model of PE, where the effective absorption density of a certain PE area is used as an exposure measure, has been exhausted. With such a model photometry accuracy and detection capability of PE can be enhanced only by the development of new types of PE. The properties of existing PE may be improved if the conventional exposure measure is complemented by a new PE parameter which can be measured simultaneously with the density. A new PE model is offered in which in addition to the density of a certain PE area, the intensity of the light scattered by the developed PE grains of the same area is measured. It has been shown that the scattered light intensity measured within a sufficient aperture and corrected for PE grain absorption can serve as a low exposure measure and demonstrates a sufficient gradient of the new CC where the conventional CC has a gradient close to zero.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yury S. Muzalievsky, "Rising of the characteristic curve gradient near photographic fog", Proc. SPIE 3140, Photometric Engineering of Sources and Systems, (26 September 1997); doi: 10.1117/12.279229; https://doi.org/10.1117/12.279229
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