65-5L:Late-News Paper: Sparkle Evaluation with Visual Weighting

Abstract

We introduce a new method for evaluation of sparkle of the combination of display and AG-layer by application of a weighting of the Fourier amplitudes of the random luminance modulations that are perceived as sparkle, according to the contrast sensitivity function of the human visual system. This new approach provides improved sensitivity to small sparkle variations, better control of parasitic low frequency components caused by non-uniformities of display illumination and an improved match to visual ratings with subtle differences in the low sparkle region.

8‐1: Standardization of Sparkle Measurement: A Solid Basis

“…In order to take this apparent size into account in the sparkle evaluation, a method had been introduced for scaling the spatial frequencies of the recorded electronic images in terms of cycles per degree subtended visual angle ( Fig. 3) and for subsequently performing a weighting of the amplitudes in the frequency domain according to the bandpass characteristics of the human visual system (contrast sensitivity function, CSF) [9]. The CSF is approximated by two linear slopes (zero at f = 0 and f = f 0 ) and a constant plateau.…”

“…We have evaluated the 6 AG samples by the weighted sum of the Fourier amplitudes normalized by the DC level, as described in detail in [9]. The monotonous relation to the spatial filtering methods is shown in Fig.…”