Wiener spectra of quantum mottle and structure mottle considering the effects of crossover exposure of front and back emulsions

By considering the relative spatial fluctuations of the exposure, including the crossover effect, causing quantum mottle and structure mottle for a dual screen/double-coated film system (dual system), we propose new equations of the Wiener spectra of the quantum mottle and the structure mottle, including the crossover effect, for front and back emulsions separately. For separating the Wiener spectra of the screen mottle into spectra of the quantum mottle and the structure mottle, we combined these new equations, using a method we proposed in 1992. We experimentally determined the Wiener spectra of the screen mottle, including the crossover effect, for the dual system for various densities at a tube voltage of 80 kV. We separated the density dependence of the Wiener spectra of the screen mottle into those of the quantum mottle and the structure mottle at various frequencies. The density dependence of the theoretical Wiener spectral values fitted the experimental Wiener spectral values of the screen mottle. These results show the validity of the new equations of the Wiener spectra of the quantum mottle and the structure mottle. Finally, from the results for various frequencies, we obtained the Wiener spectra of the quantum mottle and the structure mottle.