Characterization of projection systems for the MPEG-4 digital cinema compression scheme evaluation
Paul A. Boynton, Charles Fenimore · 2001
THX's role: provide measurement equipment; perform actual measurements used to evaluate the projectors; and provide expertise as needed.The following describes the results of the projector characterization as reported to the MPEG Digital Cinema Ad Hoc Group in July 200 1 2. Characterization of Projection Systems for the MPEG-4 Digital Cinema Compression Scheme EvaluationThe following data was collected by the THX Division of LucasFilm Ltd., Burbank, CA and by Paul Miller of the Entertainment Technology Center on June 21, 2001.The relative expanded uncertainty of the photometric measurements (with a coverage factor of k= 2) was 12 % in luminance, and ±0.005 in 1931 CIE chromaticity coordinates, based on the measurements made by THX.NIST provided technical expertise, measurement diagnostics, test patterns, and uncertainty assessment.NIST also ensured that, where relevant, each measurement followed the appropriate procedures described in the following standards [1]: ANSI/NAPM IT7.228-1 997 Electronic Projection-Fixed Resolution Projectors ANSI/PIMA IT7.227-1998 Electronic Projection-Variable Resolution Projectors VESA Flat Panel Display Measurements Standard Version 2.0 (June 2001) These measurements characterize the projector system performance on June 21, 2001, at the Wamer/Pacific Theater and at the particular settings and configurations on that day.The projection system includes the combined effect of the digital cinema projectors, projection screen, storage system, interfaces, and converters.The assigned uncertainty does not incorporate shifts due to drift, environmental changes, or readjustment of the projectors.Neither does the uncertainty imply a calibration or certification