A new auto-focus sharpness function for digital and smart-phone cameras

Siamak Yousefi, M. Rahman, N. Kehtarnavaz

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Passive auto-focusing is a key feature in digital cameras and smart-phones which uses the image sharpness information to capture focused images without any user intervention. This paper introduces a new sharpness function for achieving passive auto-focusing in digital cameras and smart-phones. It is shown that this sharpness function produces a peak when the image is in-focus and drops when the image goes out-of-focus and the amount of drop is proportional to the degree of defocus. A comparison is made between this introduced sharpness function and the commonly used sharpness functions in terms of focusing accuracy and focusing speed. The results obtained indicate that the introduced sharpness function possesses a comparable accuracy while it achieves faster focusing.

Original languageEnglish (US)
Article number6018848
Pages (from-to)1003-1009
Number of pages7
JournalIEEE Transactions on Consumer Electronics
Volume57
Issue number3
DOIs
StatePublished - Aug 1 2011
Externally publishedYes

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Digital cameras

All Science Journal Classification (ASJC) codes

  • Media Technology
  • Electrical and Electronic Engineering

Cite this

A new auto-focus sharpness function for digital and smart-phone cameras. / Yousefi, Siamak; Rahman, M.; Kehtarnavaz, N.

In: IEEE Transactions on Consumer Electronics, Vol. 57, No. 3, 6018848, 01.08.2011, p. 1003-1009.

Research output: Contribution to journalArticle

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