Granularity is a measure of fluctuations in light transmittance through an aperture as it is scanned over an image. The quality of an image depends upon its granularity; everyone has seen graining photographs — graininess is particularly noticable in enlargements. The smaller the granularity the better the quality of the image. For images captured on photographic film the underlying image structure is that of a random medium whose properties fluctuate from point to point. In order to improve image quality one needs to analyze the transport, scattering, and absorption of light in such media; absorption depends on the first moment and scattering depends on the second moments of the transmitted light.
KeywordsRandom Medium Hard Particle Improve Image Quality Joint Moment Poisson Point Process
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