Nonlinear mapping of the luminance in dual-layer high dynamic range displays

Gabriele Guarnieri; Giovanni Ramponi; Silvio Bonfiglio; Luigi Albani

doi:10.1117/12.805954

10 February 2009 Nonlinear mapping of the luminance in dual-layer high dynamic range displays

Gabriele Guarnieri, Giovanni Ramponi, Silvio Bonfiglio, Luigi Albani

Proceedings Volume 7245, Image Processing: Algorithms and Systems VII; 72450D (2009) https://doi.org/10.1117/12.805954
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States

Abstract

It has long been known that the human visual system (HVS) has a nonlinear response to luminance. This nonlinearity can be quantified using the concept of just noticeable difference (JND), which represents the minimum amplitude of a specified test pattern an average observer can discern from a uniform background. The JND depends on the background luminance following a threshold versus intensity (TVI) function. It is possible to define a curve which maps physical luminances into a perceptually linearized domain. This mapping can be used to optimize a digital encoding, by minimizing the visibility of quantization noise. It is also commonly used in medical applications to display images adapting to the characteristics of the display device. High dynamic range (HDR) displays, which are beginning to appear on the market, can display luminance levels outside the range in which most standard mapping curves are defined. In particular, dual-layer LCD displays are able to extend the gamut of luminance offered by conventional liquid crystals towards the black region; in such areas suitable and HVS-compliant luminance transformations need to be determined. In this paper we propose a method, which is primarily targeted to the extension of the DICOM curve used in medical imaging, but also has a more general application. The method can be modified in order to compensate for the ambient light, which can be significantly greater than the black level of an HDR display and consequently reduce the visibility of the details in dark areas.

Citation Download Citation

Gabriele Guarnieri, Giovanni Ramponi, Silvio Bonfiglio, and Luigi Albani "Nonlinear mapping of the luminance in dual-layer high dynamic range displays", Proc. SPIE 7245, Image Processing: Algorithms and Systems VII, 72450D (10 February 2009); https://doi.org/10.1117/12.805954

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available