An Abridged Method for Calculating Detective Quantum Efficiency by Using Mathematical Models

Abstract

An abridged method for calculating the detective quantum efficiency (DQE) by using mathematical models was developed. The mathematical models which employed in this study express (1) the photographic characteristic curve, (2) the relationship between diffuse and specular densities, and (3) the relationship between diffuse density and corresponding diffuse root-mean spuare granularity.
In this paper mathematical bases of this abridged method and application of the method to calculate DQE on a black-and-white negative film are described. The numerical values of parameters which are used in the mathematical models were obtained by experimental work. The numerical values of DQE were calculated by using the mathematical models.
It is proved that the method has an advantage in obtaining DQE, especially in maximum, of photographic material without a tedious and time-consuming procedure.