Quantifying the Visibility of Periodic Flicker

Abstract

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77‐1: Invited Paper: Modelling Visibility of Temporal Light Artefacts

“…FVM is computed as shown in Equation 1, however using an empirically determined Minkowski exponent of 2. 1/ as a function of frequency is known as the Temporal Contrast Sensitivity Function (TCSF), and it has not only been measured by us [8], but also by De Lange [5], Kelly [12] and Bodington [13]. The corresponding curves are plotted in Figure 4.…”

“…The stimuli of the various light conditions were intermingled and presented in a random order. A similar method was used in the experiments on flicker, the details of which can be found in [8].…”

A Procedure for Mitigating the Light Flicker in Office LED Lighting Caused by Voltage Fluctuations

“…Original P st curve was measured for low luminance adaptation levels, and narrow visual field, which was appropriate for home lighting in the time it was developed. In general lighting of work places adaptation luminance levels are much higher, and visual field involved could be near π steradians [22]. In the case of the high adaptation levels and wider visual field, not only the frequency of maximum sensitivity changes from 8.8 to 15-20 Hz but also sensitivity is higher.…”

“…The linearization of the IEC flicker sensitivity curve is described in [19], but it is not completely clear if the shift of frequency on the frequency axis was taken into account, since the IEC curve represents sensitivity to voltage changes per time unit, and the IEEE recommended area represents sensitivity to light output modulation as a function of frequency. Research done over the last decade shows that the frequency of maximum observer sensitivity is between 15 and 18 Hz [21,22], or the double frequency of 8.8 Hz, which is used as one of the threshold points of the linearization area based on the IEC curve.…”

50‐1: Flicker from Electronic Displays ‐ Reconsidering the Confusion

“…The value of the parameter n can be taken from the literature or it can be determined experimentally. For the conditions used in her experiments, Perz [20] states that: The "measure to predict visibility of periodic flicker for the large visual field, realistic for an office application", is obtained with n = 2. Bodington also uses a quadratic exponent which was determined assuming independence of the frequency components of a complex wave-form [17].…”