Considerations on Callier Q factor using Fourier analysis for optical noise are described.
Q factor, generally, could be given for the film having its amplitude transmittance: A as follows:
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The author assumes that the diveloped silver grain has finite transmittance because of its fine structure, and that grains distribute on film surface followed Poisson distribution. And the formula for the relation on Q and D is obtained. Theoretical results coincide well with experimental ones in low density domain, and factors which affect Q are analysed.
It is clearly explained in this paper that the granularity is not uniquely determined from Q value because Q has not information about the size of grain. But Q is a merit of granularity of one side in its root mean square value.
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