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

S. Y. Lee, Y. Kumar, J. M. Cho, S. W. Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2008 Dec


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

ASJC Scopus subject areas

  • Media Technology
  • Computer Vision and Pattern Recognition


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