Low-power passive focus measure operator based on the DCT for mobile phones

S. Y. Lee, Y. Kumar, J. M. Cho, Soo-Won Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A new focus measure operator applicable in the auto-focus function of a mobile phone has been presented. The proposed operator uses the middle frequency component of a discrete cosine transform to calculate the focus value of an image. Experimental results from various sample images show that the proposed operator requires a minimum number of operations (at least 1/5 for addition and 1/16 for multiplication) and produces reliable focus values with low auto-focusing uncertainty measure as compared to the other operators.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalImaging Science Journal
Volume56
Issue number6
DOIs
Publication statusPublished - 2008 Dec 1

Fingerprint

Mobile phones
Mathematical operators
Discrete cosine transforms
Uncertainty

Keywords

  • Auto-focus
  • DCT
  • Focus-value
  • Mobile phone

ASJC Scopus subject areas

  • Media Technology
  • Computer Vision and Pattern Recognition

Cite this

Low-power passive focus measure operator based on the DCT for mobile phones. / Lee, S. Y.; Kumar, Y.; Cho, J. M.; Kim, Soo-Won.

In: Imaging Science Journal, Vol. 56, No. 6, 01.12.2008, p. 301-306.

Research output: Contribution to journalArticle

Lee, S. Y. ; Kumar, Y. ; Cho, J. M. ; Kim, Soo-Won. / Low-power passive focus measure operator based on the DCT for mobile phones. In: Imaging Science Journal. 2008 ; Vol. 56, No. 6. pp. 301-306.
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