Measurement of spatial luminance reproduction accuracy of displays
Date & Time
Wednesday, October 26, 2022, 10:30 AM - 11:00 AM
Alexander Carpenter
Modern displays utilize complex light emission systems to allow for high dynamic range and wide color gamut image reproduction. The additional complexity causes the luminance and contrast distribution across the screen to be difficult to accurately predict. The perceptual effects of these shortcomings are partially masked in consumer displays by the spatio-temporal limitations of the human visual system. However, in the case of color-critical applications such as color grading using professional displays, inaccurate reproduction of image luminance can drive creative choices that would not have been made otherwise.
In the full paper, we will describe a measurement procedure and analysis aimed at subjectively and objectively determining the ability of a display to accurately reproduce image luminance. The procedure uses a state-of-the-art, high-resolution imaging light-measuring device (LMD) to capture per-pixel luminance on a screen and compare it against the luminance distribution of the source image. Because of the limits imposed by the resolution of the LMD and the oversampling necessary to capture individual display pixels, the procedure operates on a section of the screen. The procedure includes steps for registering the image measured by LMD to the reference image, compensating for lens distortions and simulating the MTF of the lens.
The paper will also contain example results collected for several professional grading displays along with an analysis of their performance. The test content used in the measurement contained a combination of synthetic imagery and real-world graded content from publicly available datasets. We have developed the procedure for color-critical applications to evaluate the performance of displays to determine luminance reproduction accuracy in complex scenes.
Location Name
Salon 1
Take-Aways from this Presentation
The three main takeaways from the paper: - a description of a measurement procedure that allows for display luminance accuracy characterization on a per-pixel basis, - an analysis procedure that allows for subjectively and objectively evaluating the display performance and comparing the results against the reference version of the image, - a set of measurements for several existing professional displays used commonly in color grading along with the results of the analysis on a dataset of test images
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