Backlight power reduction using efficient image compensation for mobile devices

Tae Hyun Kim, Kang Sun Choi, Sung-Jea Ko

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Since backlight dimming widely used for power reduction of mobile devices degrades the image quality in brightness and contrast, image enhancement is exploited to compensate the degradation. In this paper, we propose a novel backlight power reduction scheme using an efficient image compensation algorithm that scales discrete cosine transform (DCT) coefficients of image in the compressed domain. To reduce the computational burden of the conventional backlight dimming method where decompression is performed prior to image compensation in the spatial domain, we introduce a computationally efficient image compensation algorithm that processes only dominant DCT coefficients of images using a mapping function in the DCT domain. Experimental results indicate that our proposed method provides higher visual quality with reduced complexity as compared to conventional image compensation schemes.

Original languageEnglish
Article number5606354
Pages (from-to)1972-1978
Number of pages7
JournalIEEE Transactions on Consumer Electronics
Volume56
Issue number3
DOIs
Publication statusPublished - 2010 Aug 1

Keywords

  • DCT coefficients
  • Image enhancement
  • LCD backlight control
  • luminance compensation
  • mobile devices

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Media Technology

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