Speedup of optimization-based approach to local backlight dimming of HDR displays

Nino Burini; Ehsan Nadernejad; Jari Korhonen; Soren Forchhammer; Xiaolin Wu

doi:10.1117/12.923646

30 April 2012 Speedup of optimization-based approach to local backlight dimming of HDR displays

Nino Burini, Ehsan Nadernejad, Jari Korhonen, Soren Forchhammer, Xiaolin Wu

Proceedings Volume 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II; 84360B (2012) https://doi.org/10.1117/12.923646
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

Local backlight dimming in Liquid Crystal Displays (LCD) is a technique for reducing power consumption and simultaneously increasing contrast ratio to provide a High Dynamic Range (HDR) image reproduction. Several backlight dimming algorithms exist with focus on reducing power consumption, while other algorithms aim at enhancing contrast, with power savings as a side effect. In our earlier work, we have modeled backlight dimming as a linear programming problem, where the target is to minimize the cost function measuring the distance between ideal and actual output. In this paper, we propose a version of the abovementioned algorithm, speeding up execution by decreasing the number of input variables. This is done by using a subset of the input pixels, selected among the ones experiencing leakage or clipping distortions. The optimization problem is then solved on this subset. Sample reduction can also be beneficial in conjunction with other approaches, such as an algorithm based on gradient descent, also presented here. All the proposals have been compared against other known approaches on simulated edge- and direct-lit displays, and the results show that the optimal distortion level can be reached using a subset of pixels, with significantly reduced computational load compared to the optimal algorithm with the full image.

Citation Download Citation

Nino Burini, Ehsan Nadernejad, Jari Korhonen, Soren Forchhammer, and Xiaolin Wu "Speedup of optimization-based approach to local backlight dimming of HDR displays", Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 84360B (30 April 2012); https://doi.org/10.1117/12.923646

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