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

被引：13
作者：
Burini, Nino [1 ]
Mantel, Claire [1 ]
Nadernejad, Ehsan [1 ]
Korhonen, Jari [1 ]
Forchhammer, Soren [1 ]
Pedersen, Jesper Meldgaard [2 ]
机构：
[1] Tech Univ Denmark, Dept Photon Engn, DK-2800 Lyngby, Denmark
[2] Bang & Olufsen AS, DK-7600 Struer, Denmark
来源：
JOURNAL OF DISPLAY TECHNOLOGY | 2014年 / 10卷 / 01期
关键词：
Backlight dimming; flicker; image quality; LED backlight; light leakage; liquid crystal display (LCD); optimization; power saving; video; LIQUID-CRYSTAL DISPLAYS; IMAGE; LCDS;
D O I：
10.1109/JDT.2013.2286213
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：71 / 79
页数：9
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