Limitations of visual gamma corrections in LCD displays
Parraga, Carlos Alejandro (Universitat Autònoma de Barcelona. Departament de Ciències de la Computació)
Roca-Vila, Jordi (Centre de Visió per Computador (Bellaterra, Catalunya))
Karatzas, Dimosthenis (Centre de Visió per Computador (Bellaterra, Catalunya))
Wuerger, Sophie M. (University of Liverpool. Department of Psychological Sciences)

Data:	2014
Resum:	A method for estimating the non-linear gamma transfer function of liquid-crystal displays (LCDs) without the need of a photometric measurement device was described by Xiao et al. (2011) [1]. It relies on observer's judgments of visual luminance by presenting eight half-tone patterns with luminances from 1/9 to 8/9 of the maximum value of each colour channel. These half-tone patterns were distributed over the screen both over the vertical and horizontal viewing axes. We conducted a series of photometric and psychophysical measurements (consisting in the simultaneous presentation of half-tone patterns in each trial) to evaluate whether the angular dependency of the light generated by three different LCD technologies would bias the results of these gamma transfer function estimations. Our results show that there are significant differences between the gamma transfer functions measured and produced by observers at different viewing angles. We suggest appropriate modifications to the Xiao et al. paradigm to counterbalance these artefacts which also have the advantage of shortening the amount of time spent in collecting the psychophysical measurements.
Ajuts:	Ministerio de Educación y Ciencia CSD2007-00018 Ministerio de Ciencia e Innovación TIN2010-21771-C02-01
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Display calibration ; Luminance matching ; Observer-based calibration ; Perceptual ; Psychophysics ; Visual gamma correction
Publicat a:	Displays, Vol. 35, Issue 5 (December 2014) , p. 227-239, ISSN 0141-9382

DOI: 10.1016/j.displa.2014.07.001

Postprint 30 p, 1.8 MB

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