Modeling the Subjective Quality of Highly Contrasted Videos Displayed on LCD With Local Backlight Dimming

Claire Mantel, Søren Bech, Jari Korhonen, Søren Forchhammer, Jesper Melgaard Pedersen

Research output: Contribution to journalJournal articlepeer-review

Abstract

Local backlight dimming is a technology aiming at both saving energy and improving visual quality on television sets. As the rendition of the image is specified locally, the numerical signal corresponding to the displayed image needs to be computed through a model of the display. This simulated signal can then be used as input to objective quality metrics. The focus of this paper is on determining which characteristics of locally backlit displays influence quality assessment. A subjective experiment assessing the quality of highly contrasted videos displayed with various local backlight-dimming algorithms is set up. Subjective results are then compared with both objective measures and objective quality metrics using different display models. The first analysis indicates that the most significant objective features are temporal variations, power consumption (probably representing leakage), and a contrast measure. The second analysis shows that modeling of leakage is necessary for objective quality assessment of sequences displayed with local backlight dimming.
Original languageEnglish
JournalIEEE Transactions on Image Processing
Volume24
Issue number2
Pages (from-to)573-582
ISSN1057-7149
DOIs
Publication statusPublished - 2015

Keywords

  • Displayed image quality
  • Backlight dimming,
  • Video quality
  • Contrast
  • LED backlight
  • Light leakage
  • Liquid crystal display (LCD).

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