Adaptive local backlight dimming algorithm based on local histogram and image characteristics

Ehsan Nadernejad, Nino Burini, Jari Korhonen, Søren Forchhammer, Claire Mantel

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

Liquid Crystal Display (LCDs) with Light Emitting Diode (LED) backlight is a very popular display technology, used for instance in television sets, monitors and mobile phones. This paper presents a new backlight dimming algorithm that exploits the characteristics of the target image, such as the local histograms and the average pixel intensity of each backlight segment, to reduce the power consumption of the backlight and enhance image quality. The local histogram of the pixels within each backlight segment is calculated and, based on this average, an adaptive quantile value is extracted. A classification into three classes based on the average luminance value is performed and, depending on the image luminance class, the extracted information on the local histogram determines the corresponding backlight value. The proposed method has been applied on two modeled screens: one with a high resolution direct-lit backlight, and the other screen with 16 edge-lit backlight segments placed in two columns and eight rows. We have compared the proposed algorithm against several known backlight dimming algorithms by simulations; and the results show that the proposed algorithm provides better trade-off between power consumption and image quality preservation than the other algorithms representing the state of the art among feature based backlight algorithms. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageEnglish
JournalProceedings of SPIE, the International Society for Optical Engineering
Volume8652
Pages (from-to)86520V
Number of pages13
ISSN0277-786X
DOIs
Publication statusPublished - 2013
EventIS&T/SPIE Electronic Imaging : Color Imaging XVIII: Displaying, Processing, Hardcopy, and Applications - Hyatt Regency San Francisco Airport Hotel, Burlingame, California, United States
Duration: 3 Feb 20137 Feb 2013

Conference

ConferenceIS&T/SPIE Electronic Imaging : Color Imaging XVIII: Displaying, Processing, Hardcopy, and Applications
LocationHyatt Regency San Francisco Airport Hotel
CountryUnited States
CityBurlingame, California
Period03/02/201307/02/2013

Keywords

  • Local backlight dimming
  • Liquid crystal display
  • Light emitting diode backlight
  • Image histogram
  • High dynamic range display

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