Abstract
AbstractIn the application of photography to problems involving low light levels and limiting detection criteria, it can be instructive to consider the photographic process simply as a photon counter. For in spite of the conclusions from low measured DQE values that the photographic process is inefficient in this respect, in this way the principles involved in systems optimisation can be understood without the difficulties which may arise when considering the photographic process as a density meter. The physical significance of the noise-equivalent number of quanta is discussed, and numerical examples are given for the S/N ratio gains which might be made using DQE rather than gamma-to-signa ratio criteria. It is indicated why the DQE for grain counts may be higher than that for density measurementS.
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