42.4: Sparkle Measurement Revisited: A Closer Look at the Details

• Published in: SID International Symposium Digest of technical papers Vol. 45; no. 1; pp. 607 - 610
• Main Author: Becker, Michael E.
• Format: Journal Article
• Language: English
• Published: Campbell Blackwell Publishing Ltd 01.06.2014; Wiley Subscription Services, Inc
• Subjects: anti-glare coating; BRDF; contrast under ambient illumination; Foundations; Frequency domains; glare; Imaging; micro-structured surface; Modulation; Sampling; scattering; sparkle; Spatial filtering; Statistical tests
• ISSN: 0097-966X; 2168-0159
• DOI: 10.1002/j.2168-0159.2014.tb00159.x

Three years after introduction of the first instrument for measurement of sparkle the foundations have been reconsidered and the pool of practical experience has been analyzed to provide a more detailed and complete picture of the subject matter. The following aspects are introduced and discussed: observation conditions and resulting requirements for the imaging optics, imaging of the display under test (2‐dimensional sampling), analysis of spatial periods and frequencies as basis for separation of periodic and statistic intensity modulations, sparkle evaluation based on analysis of single images and difference images, spatial filtering concepts, sparkle in the frequency domain, pseudo‐sparkle, scaling and bias in sparkle evaluation, verification of the method.