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Sparkle contrast strongly depends on the measurement conditions, such as Working Distance (WD), F# setting of lens, filtering method of removing the display pixel components, etc. However, there is no established understanding how and why the sparkle contrast depends on the measurement conditions. We have succeeded to explain the dependence clearly from the view point of spatial frequency range limited by Aperture Angle (AA), camera sampling property, filtering property, and the angular distribution of the AG scattering property. We also showed the ranking of sparkle contrast could be inversed in some conditions, and we found that AA should be set to 0.35 degree or less to evaluate the sparkle level which we observed by human-eye .

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