Brightness Model for Neutral Self-Luminous Stimuli and Backgrounds

ABSTRACT

The fundamental goal of color appearance research is to establish a correlation between the optical properties of stimuli and their corresponding perceptual attributes. Stimuli seen on a self-luminous background occur frequently in everyday situations when viewing lamps and luminaires, luminous panels with light emitting diodes (LEDs) and organic light emitting diodes (OLEDs), traffic signals, and advertisements. In this article, the impact of the luminance of a neutral self-luminous background on the brightness perception of neutral self-luminous stimuli was investigated in a series of magnitude estimation experiments. A brightness model has been developed with the spectral radiance from stimulus and background as input. The cone excitations are calculated using the CIE 2006 10° cone fundamentals. Luminance adaptation to the background is included by adopting a background-dependent semisaturation constant in the Michaelis-Menten function modeling cone response compression. The performance of the model is very good if negative and positive contrast scenes are modeled independently.

KEYWORDS :

• Brightness model
• brightness perception
• self-luminous

Disclosure statement

The authors report no declarations of interest.

Additional information

Funding

This research was supported by the Research Council of the KU Leuven (OT/13/069 and C24/17/051). Kevin Smet was supported by the Research Foundation Flanders through a postdoctoral fellowship (12B4916N), Fonds Wetenschappelijk Onderzoek (12B4916N), and KU Leuven (C24/17/051, OT/13/069).