Block-Based Gradient Descent for Local Backlight Dimming and Flicker Reduction

Nino Burini; Claire Mantel; Ehsan Nadernejad; Jari Korhonen; Søren Forchhammer; Jesper Melgaard Pedersen

doi:10.1109/JDT.2013.2286213

Block-Based Gradient Descent for Local Backlight Dimming and Flicker Reduction

Nino Burini, Claire Mantel, Ehsan Nadernejad, Jari Korhonen, Søren Forchhammer, Jesper Melgaard Pedersen

Bang & Olufsen A/S

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Local backlight dimming technology is a two-fold improvement for LED backlit LCD screens that allows to reduce power consumption and increase visual quality. This paper presents a fast version of an iterative backlight dimming algorithm based on gradient descent search. The speed is increased by exploiting the local uniformity of backlight to reduce the complexity for determining the optimal backlight of a given image. The algorithm is adapted to video sequences by using the backlight of the previous frame as a starting point to calculate the backlight for the current frame. Fast variations of backlight dimming over time can produce a visually annoying flicker artifact. To avoid this artifact, a control mechanism is also proposed.

Original language	English
Journal	Journal of Display Technology
Volume	10
Issue number	1
Pages (from-to)	71-79
ISSN	1551-319X
DOIs	https://doi.org/10.1109/JDT.2013.2286213
Publication status	Published - 2014

Keywords

Backlight dimming
Video
Flicker
Image quality
LED backlight
Light leakage
Liquid crystal display (LCD)
Optimization
Power saving

Access to Document

10.1109/JDT.2013.2286213

OpenUrl availability

Full text

Cite this

@article{c8b165f809ac4211bcfe7dd1f4f625e1,

title = "Block-Based Gradient Descent for Local Backlight Dimming and Flicker Reduction",

abstract = "Local backlight dimming technology is a two-fold improvement for LED backlit LCD screens that allows to reduce power consumption and increase visual quality. This paper presents a fast version of an iterative backlight dimming algorithm based on gradient descent search. The speed is increased by exploiting the local uniformity of backlight to reduce the complexity for determining the optimal backlight of a given image. The algorithm is adapted to video sequences by using the backlight of the previous frame as a starting point to calculate the backlight for the current frame. Fast variations of backlight dimming over time can produce a visually annoying flicker artifact. To avoid this artifact, a control mechanism is also proposed.",

keywords = "Backlight dimming, Video, Flicker, Image quality, LED backlight, Light leakage, Liquid crystal display (LCD), Optimization, Power saving",

author = "Nino Burini and Claire Mantel and Ehsan Nadernejad and Jari Korhonen and S{\o}ren Forchhammer and Pedersen, {Jesper Melgaard}",

year = "2014",

doi = "10.1109/JDT.2013.2286213",

language = "English",

volume = "10",

pages = "71--79",

journal = "Journal of Display Technology",

issn = "1551-319X",

publisher = "IEEE",

number = "1",

}

TY - JOUR

T1 - Block-Based Gradient Descent for Local Backlight Dimming and Flicker Reduction

AU - Burini, Nino

AU - Mantel, Claire

AU - Nadernejad, Ehsan

AU - Korhonen, Jari

AU - Forchhammer, Søren

AU - Pedersen, Jesper Melgaard

PY - 2014

Y1 - 2014

N2 - Local backlight dimming technology is a two-fold improvement for LED backlit LCD screens that allows to reduce power consumption and increase visual quality. This paper presents a fast version of an iterative backlight dimming algorithm based on gradient descent search. The speed is increased by exploiting the local uniformity of backlight to reduce the complexity for determining the optimal backlight of a given image. The algorithm is adapted to video sequences by using the backlight of the previous frame as a starting point to calculate the backlight for the current frame. Fast variations of backlight dimming over time can produce a visually annoying flicker artifact. To avoid this artifact, a control mechanism is also proposed.

AB - Local backlight dimming technology is a two-fold improvement for LED backlit LCD screens that allows to reduce power consumption and increase visual quality. This paper presents a fast version of an iterative backlight dimming algorithm based on gradient descent search. The speed is increased by exploiting the local uniformity of backlight to reduce the complexity for determining the optimal backlight of a given image. The algorithm is adapted to video sequences by using the backlight of the previous frame as a starting point to calculate the backlight for the current frame. Fast variations of backlight dimming over time can produce a visually annoying flicker artifact. To avoid this artifact, a control mechanism is also proposed.

KW - Backlight dimming

KW - Video

KW - Flicker

KW - Image quality

KW - LED backlight

KW - Light leakage

KW - Liquid crystal display (LCD)

KW - Optimization

KW - Power saving

U2 - 10.1109/JDT.2013.2286213

DO - 10.1109/JDT.2013.2286213

M3 - Journal article

SN - 1551-319X

VL - 10

SP - 71

EP - 79

JO - Journal of Display Technology

JF - Journal of Display Technology

IS - 1

ER -

Block-Based Gradient Descent for Local Backlight Dimming and Flicker Reduction

Abstract

Keywords

Access to Document

OpenUrl availability

Fingerprint

Cite this